- main runner
- main section
- main sewer
- main truss
- main van
- mainframe
- maintenance grader
- maintenance yard
- maize store
- major event
- majorant
- maleic resin
- malicious
- mall hammer
- mammoth
- management engineering
- management process
- managing group
- managing projects
- managing unit
- maintenance standards
- majestic
- major road
- major street
- makeup program
- malm
- managed price
- management
- management structure
- mancar
- manila rope
- manner
- manning table
- manoetivre
- mantel tree
- mantle block
- map out
- mandatory standard
- manhole door
- manifesto
- manoeuver
- manoeuvrable bracing
- manpower
- manpower movement
- mansard
- mantel
- manual batcher
- manual crane
- manual cutting
- manual shear
- manual welding
- manufactured products
- manure collector
- manure duct
- manure storage
- manuscript division
- manway compartment
- map catalog
- map coordinate
- map feature
- map number
- map paper
- map projection
- marble glass
- marble slab
- marbleize
- margalitic
- margin light
- marginal
- marine dredger
- market concentration
- market pavilion
- marketer
- marking
- marble quarry
- marginal beam
- marginal land
- Marginal revenue
- marginal strip
- marine
- marine aggregate
- marine climate
- marine terminal
- maritime
- maritime zone
- mark
- marked face
- market analysis
- market center
- Marketing
- marking tool
- marl clay
- marl loam
- marlaceous
- marlstone
- marly limestone
- marquee box
- marshalling
- maskable
- masking tap