- dap
- dapped joint
- dark glass
- darkroom
- Darlington amplifier
- dash
- dash pot
- dashboard
- dashing vessel
- data area
- data bit
- data break
- data card
- data chain
- data code
- data collection
- data communications
- data compression
- data deck
- data dictionary
- data entity
- data frame
- data group
- data item
- data label
- data manipulation
- data path
- data plotter
- data port
- data queue
- data rate
- data receiver
- data record
- data recording
- data reliability
- data resource
- data security
- data service
- data sets
- data sheet
- data space
- data storage
- data store
- data string
- data transmission
- data value
- data way
- data-in
- database computer
- database processor
- dataset label
- date code
- date line
- date separators
- date-book
- datum block
- datum line
- datum surface
- day labour
- day off
- day wage
- daylight control
- daywork
- dazzling
- DB-25 connector
- de-allocate
- de-embrittle
- de-energize
- deactivate
- dead angle
- dead bolt
- dead burned
- dead centre
- dead dyke
- dead face
- dead ground
- dead iron
- dead lime
- dead pass
- dead spot
- dead time
- dead volcano
- dead weight
- dead zone
- deadbolt
- deadman
- deadweight gauge
- deaerate
- deal
- deasphaalt
- death process
- debarking
- debenture
- debiteuminization
- debug
- debugger
- debugging package
- Debye force
- deficit
- defile