- MEP engineering A company which designs mechanical, electrical, and plumbing systems in a structure.
- machine assembly A factory for the manufacture of complex mechanical objects which perform work.
- machine roomless elevator One or more gearless traction elevators where the lift mechanism fits entirely within the hoistway.
- machine structure Structures which operate as machines or as integral parts of mechanized processes.
- machinery service Facilities for maintenance and service of industrial machines and heavy-duty vehicles.
- machinery shell An enclosure for mechanical equipment with very limited if any human accessibility.
- machinery wholesaler A place where machinery is sold in bulk to clothing stores or to large commercial purchasers.
- magazine A topical publication which is printed on a periodical basis.
- magenta A bright purplish-pink color; one of the three subtractive primaries.
- maglev traffic A site or structure used as a route for magnetic levitation trains.
- mahogany A very dark shade of orange mixed with a bit of brown.
- mail chute A duct for dropping letters from the upper floors of a building to a mailbox below.
- mail distribution center A place for collection and distribution of mail between the sender and receiver.
- main address The primary mailing address of a property, or the numbered location of its main entrances.
- main contractor The leading construction company on a project.
- main contractor selected The lead contractor for a structure's construction is appointed by contract.
- main roof height The vertical elevation of the primary roofplate, not including small penthouses and turrets.
- main train station A major intercity train station with many platforms.
- maintenance Space used for heavy-duty non-retail maintenance, repair, and upkeep of products and facilities.
- maintenance Companies which provide regular upkeep or repair services.
- maintenance catwalks Elevated walkways providing access to otherwise inaccessible places.
- male restrooms Toilet facilities designated for use by men only.
- mandir A sacred place of worship in the Hindu faith.
- manganese mine A site where naturally occurring manganese ore is extracted from the earth.
- mannerist European architecture between Renaissance and Baroque with an emphasis on creative variation in a classical vocabulary.
- manufactured commodity storage Bulk storage facilities for homogeneous products created through fabrication processes.
- manufacturing Companies and organizations involved in producing supplies and assembled goods.
- manufacturing Space for mass production of goods using machinery.
- map An abstracted diagram of land features or built spaces, including floor plans.
- marble Flooring made of marble blocks or tiles.
- marble A brittle rock formed from calcite crystal and prized for its mottled patterns.
- marble quarry A site where metamorphic carbonate rock is extracted from the earth in large blocks or sheets.
- marbling Mixtures of different colors without clear format or shapes.
- marijuana dispensary Retail space specializing in cannabis and derived products for medical or recreational use.
- market A geographical area or segment of entities within an area which is commonly treated as a unit for economic analysis.
- market square An open paved area within a street system, traditionally used for open markets or large gatherings of people.
- marketing Companies and organizations associated with promotion and publicity.
- marketing agency A company which directs advertising and publicity programs.
- marketplace A space where multiple small vendors set up stalls to sell their wares separately.
- maroon Brick red; a dark, brownish shade of red.
- marquee A canopy projecting from a facade to display informative signage, especially on a theater.
- marsupial exhibit A zoo habitat for housing and displaying kangaroos, wombats, or other pouched mammals.
- martial arts Space for performances and competitions in traditional fighting arts.
- masonry A load-bearing frame composed of many small solid units stacked or piled on top of each other.
- masonry A load-bearing staircase frame built of bricks, rocks, or other hard pieces stacked and joined together.
- masonry A facade made of individual blocks stacked on top of each other.
- masonry chimney A building summit formed by a masonry-enclosed passage for steam, smoke, or other gas.
- masonry with steel A load-bearing frame in which steel beams or rebar and masonry are used together to counteract lateral forces.
- masonry with wood A load-bearing frame in which wood beams and masonry are used together to counteract lateral forces.
- mass Measurements of material amounts or weights.
- mass media Spaces used for the creation and broadcasting of recorded media.
- massage A location for professional services in which pressure and manipulation is applied to bodily tissues for well being and relaxation.
- mast A very narrow structure without interior space designed to hold something very high.
- mastaba A flat-topped construction of solid masonry with sloping sides.
- master plan architect A company which designs the basic plan for a large development, including general guidelines for buildings within it.
- master plan developer A company which organizes the overall development scheme for a multi-parcel site.
- mat foundation A foundation consisting of a very thick continuous concrete slab.
- mauve A very light shade of purple, between purple and white.
- maximum core-to-perimeter distance The maximum horizontal distance from the outer wall of a building's core to the inner wall of its perimeter.
- maximum floor overhang distance The maximum extent that a floorplate in an object overhangs the unenclosed space below it.
- maximum height reached The highest point on a structure is fixed in place during construction.
- maximum roof overhang distance The maximum extent that the roof of a structure overhangs the unenclosed space below it.
- maximum speed The highest speed allowed for transportation through a place or object.
- maximum vehicle weight The practical or allowed weight limit for vehicles entering a particular place or facility.
- mayan Architecture of the ancient Maya peoples, best known for large symmetrical stone pyramids and vaulted temples.
- mayan revival A twentieth century revival of classical Mayan stylistic features.
- meandering stairway Stairs which turn at or between levels but do not fold back in the same stairwell.
- measurement Direct ascertainment of data through careful scaling of the original object.
- measurement station A manned or automated site for taking in information or data.
- measurements Numerical expressions of an object's dimensions expressed in standard units.
- mechanical engineering A company which designs the systems that heat, cool, and ventilate a structure.
- mechanical feature Properties of a building's mechanical and infrastructural systems.
- mechanical floor A full floor level above ground filled with mechanical equipment and not generally accessible to occupants.
- mechanical penthouse A mechanical floor level at the top of a building which is set back from the building's perimeter.
- mechanical systems installation A contractor which installs multiple mechanical systems in a building.
- media room A commonly available room designated for screening films, videos, games, or television programs.
- media/technology store A retail outlet specializing in recorded media or consumer technology.
- medical administration Office space for the management of a hospital or other medical facility.
- medical clinic Doctor offices and treatment centers for outpatient care.
- medical heliport A site for take-offs and landings of emergency medical helicopters.
- medical school Classroom space for higher education in medical science and doctor training.
- medical testing Places designated for laboratory testing for medical purposes, usually not in the presence of patients.
- medieval norwegian Vernacular architecture of medieval Norway, typified by stave churches.
- meeting place A place designated for people to gather and associate for common purposes.
- memorial An object or site used to mark something in the past or otherwise intended for being commemorated.
- men's clothing store Retail space specializing in clothing for men and boys.
- menhir A rough-hewn or uncut rock planted upright in the ground.
- merged A company which has merged with another company into a new identity.
- metadata Terms which pertain to the organization of data, either visible or internal.
- metal Facade materials made from malleable mineral substances.
- metal A load-bearing frame composed of pure or alloyed metallic structural members.
- metal detectors at entry Apparatuses at the entrance which screen persons for metal objects being carried in.
- metal shingles Roofing made from small overlapping plates of sheet metal.
- metal storage Space for bulk storage of raw metals.
- metalworking A place where raw metals are shaped into usable products through manipulation.
- methodist church A house of worship in the Methodist faith.
- metro station A site where passengers regularly board and alight from subways, light rail, and rapid transit in an urban network.
- metropolitan area A population center comprising several cities in geographical proximity with close economic interaction.
- mexican fast food A fast food restaurant specializing in Mexican cuisine, where food is ordered and picked up at a counter.
- mexican restaurant A restaurant specializing in Mexican cuisine.
- mezzanine A floor level above ground which does not fill the entire space within the building's perimeter.
- microwave-relay phone transmission A site for transmission of telephone signals through the air by line-of-sight microwaves.
- middle eastern fast food A fast food restaurant specializing in Middle Eastern cuisine, where food is ordered and picked up at a counter.
- middle eastern restaurant A restaurant specializing in a cuisine of any part of the Middle East, including northern Africa.
- mileage marker The position of an object along a route which is officially measured in miles.
- military Spaces for training and exercises by the armed forces of any government.
- military aircraft hangar Enclosed space for storage and/or maintenance of aircraft used by military or governmental security forces.
- military housing Housing designated specifically for soldiers or officers in any military force.
- military office Administrative working space for military institutions.
- military recruitment center A place dedicated to attracting and enlisting personnel for military service.
- militia training Training and exercise space for internal security forces.
- milk storage Space for bulk storage of raw milk.
- millwork contractor A company which builds or installs the woodwork in a building.
- mineral flooring Flooring materials consisting of natural or aggregate earth or mineral substances.
- mineral mining A site where solid minerals other than gems are extracted from the earth in raw form for eventual use.
- mineral wool batts Thick flexible sheets or stuffed bags with a dense mass of fibers made from natural or synthetic minerals.
- mineral wool loose fill Loose fibers of mineral origin used as thermal insulation.
- mineral wool rigid panels Hard panels made of fibers derived from rock or slag.
- minigolf A compact golf course where players hit balls through creative obstacles into small holes.
- minimum core-to-perimeter distance The minimum horizontal distance from the outer wall of a building's core to the inner wall of its perimeter.
- minimum rentable area The smallest division of floor space available for rent or lease within a structure.
- minimum speed The lowest speed allowed for transportation through a place or object.
- mining Places where commodities and raw products are extracted from the ground.
- mint A pale shade of green or light green.
- missing floor A floor level which does not exist, and is skipped in a building's numbering system.
- mission house A space for provision of charity, especially food and clothing.
- mixed materials A load-bearing frame composed of multiple materials acting together to provide structural support.
- mixed materials A roof-supporting framework made of more than one major component material.
- mixed sports A venue designed to hold a wide variety of sporting activities.
- mixed-use building A large building with multiple primary uses in completely different categories.
- modern Architecture from the mid-20th century onwards, with simple forms suited to mass production of building materials.
- modern style Architectural styles of the present era which derive their aesthetic from the practical and functional qualities of buildings.
- modular space manufacturer A company that makes modular units, e.g. shipping containers, used in buildings of modular construction.
- module Any part of a structure which is treated separately in order to assign specific data or object relations to it.
- monastery Group housing for members of a cloistered religious order.
- monastery chapel A house of worship that belongs to a monastery or other religious community, and is not a parish church.
- mongolian barbecue An Asian-type restaurant where customers mix their own ingredients for cooking on a griddle.
- monolith A simple upright shaft with the appearance of a solid mass.
- monorail station A site where passengers board and alight from single-rail trains.
- monorail traffic A site or structure used as a route for single-rail trains.
- monument Decorative or symbolic structures which generally have some referential meaning for the local place or population.
- monumental building A building with oversized interior spaces or with very high appendages that do not contain regular floors.
- mooring A bond between a floating structure and a fixed point.
- moorish revival A romantic revival of Mudéjar or classical Moorish architecture of Spain and North Africa.
- mormon temple A house of prayer and worship in the Mormon faith.
- moroccan restaurant A restaurant specializing in Moroccan cuisine.
- mortgage bank A bank which specializes in making direct mortgage loans to customers.
- mosaic Flooring composed of many small pieces of colored stone in a decorative pattern.
- mosaic on facade A tiled artwork or decorative design covering a significant portion of the exterior.
- mosque A house of worship built for Islamic prayers and services.
- mosque A dedicated place of worship for the Islamic faith.
- motel A hotel space for motorists where individual rooms are accessed from outdoors.
- motion ride Places where people experience thrilling or pleasurable motion, either as a ride or simulation.
- motocross A place for motorcycle racing on an off-road circuit with obstacles.
- motorbike rental A place where motorcycles or other motorized cycles can be rented.
- motorcycle parking A place designated for temporary storage of motorcycles when not in use.
- motorcycle track racing A venue for racing motorized cycles on a smooth track.
- mound A construction formed by piling loose material such as rocks or earth.
- movable bridge A bridge of any form which is capable of controlled movement in order to lift or remove its span.
- movable sunshades Movable elements in front of a facade which limit the amount of sunlight entering windows.
- movable wall A full-height internal or external partition whose position can be easily shifted.
- movie studio A site designated for the production of motion pictures.
- mughal Architecture of South-Central Asia from the Mughal reign blending Indian and Islamic features, often with domes and profusions of arches.
- multi-level porch A series of outdoor platforms attached to a building and connected vertically by stairs.
- multi-lit A window which is subdivided into many small rectangular panes.
- multi-tenant design Built space intended for more than one occupants, with provisions for both common and private areas.
- multi-use sports Space designated for more than one sport or athletic usage.
- multi-winged A floor plan with various wings connected to a spine and forming courtyards.
- multicolor Composed of a wide assortment of different colors.
- multilegged water tower A tank of liquid supported at the sides or corners by multiple legs.
- municipal police station A base office for a city or village police department.
- mural on facade A painted artwork covering a significant portion of the exterior.
- museum Space for collecting and displaying valuable artifacts and/or educational exhibits.
- mushroom cultivation Areas for growing and harvesting any kind of edible fungus for food.
- music club A lounge where people go to hear music.
- music rehearsal space A place designated for practicing and rehearsing musical performances.
- music school Classroom space for training in musical arts and performance.
- musical instrument store Retail space specializing in any kind or types of musical instruments.
- musical theater A performance space used mainly for musical plays.
- myrtle An extremely dark, almost blackish, shade of green.