- microfilm recorder
- micromodule
- microprogram
- microprogrammable instruction
- microwave communication
- microwave device
- message area
- message blocking
- message cancel
- message center
- message count
- message description
- message digit
- message editing
- message exchange
- message file
- message frame
- message generation
- message header
- message help
- message identifier
- message indicator
- message member
- message number
- message queue
- message queuing
- message registration
- message retrieval
- message segment
- message source
- message subfile
- message text
- message trailer
- message type
- messaging system
- meta-class
- metabelian
- metacenter
- metacharacter
- metacyclic group
- metafile
- metafile generator
- metaharmonic
- metamathematical
- metering pulses
- methodological
- metric coefficient
- metric density
- metric lattice
- metric product
- metric system
- metric transformation
- metrication
- micro
- micro data
- microcapacitor
- microcellular network
- microcode
- microdiagnostic program
- microeconomic
- microelectronic circuitry
- microelement
- microfiche
- microfloppy disk
- micrographics
- micrologic adder
- microoperation
- microphone boom
- microprogram sequencer
- microspace justification
- microvolt meter
- microwave channel
- microwave detector
- microwave generator
- middle latitudes
- midperpendicular
- mike mixer
- milestone copy
- mine digging
- mini computer
- mini-icon
- minidisk directory
- minifloppy
- minimal line
- minimal polynomial
- minimal simulation
- minimal variety
- minimax approximation
- minimax loss
- minimize icon
- minimum configuration
- minimum-delay
- minor axis
- minor node
- minor predicate
- minute digit
- mirror
- mirror drive
- mirror image
- mirror line