- mechanical ventilation
- mechanized painting
- medallion
- mediate
- medical center
- medieval period
- medium brick
- medium sand
- medium soil
- medium steel
- meeting rail
- meeting rails
- megalopolis
- megastructure
- melamine laminate
- melamine resin
- melioration work
- mellow soil
- melody
- melt
- melter
- melting factor
- melting zone
- membrane bunking
- membrane filter
- membrane panel
- membrane state
- memorandum
- memorial
- memorial center
- memorize
- memory
- memory array
- memory board
- memory map
- mender
- menders
- meniscus glass
- mental strength
- menthol
- mention
- menu bar
- menu design
- menu item
- menu key
- mephitic
- merge cells
- merging documents
- merging styles
- meridian lane
- meridian stress
- metal
- metal cutter
- metal formwork
- metal mould
- metal plating
- metalled road
- metallic sleeper
- metallic tape
- metamorphose
- meteorological mast
- meter pit
- methacrylic ester
- methane fermentation
- methylmethecrylate
- metric pitch
- metropolitan district
- mezzanine
- mezzanine floor
- mica sandstone
- microcomputer
- microenvironment
- microfilm
- microfilm enlarger
- microfilm viewer
- microfilming machine
- microline
- micrometer draft
- microporous
- middle plane
- middle purlin
- midland region
- midspan load
- mild steel
- military aviation
- military sector
- militia
- milking parlor
- mill load
- mill saw
- millerite
- millihenry
- millimeter paper
- mesorelief
- message ensemble
- message hanger
- meta1 building
- metabolism
- metal bath
- metal bridge