- datum
- DB meter
- de-update
- dead halt
- dead key
- dead space
- deadlock avoidance
- de-underline
- dead code
- deadline
- death rate
- deblock
- debug mode
- debugging
- debugging monitor
- debugging routine
- decade scaler
- decagonal
- decahedral
- decameter
- decay
- decayed knot
- decentralized processing
- decibel
- decimal adder
- decimal location
- decimal operator
- decimal radix
- decimal tabbing
- deciphering
- decision
- decision criterion
- decision gate
- decision tree
- declaration
- declarative section
- declaratives
- decollating machine
- decoupled
- dedicated
- dedicated node
- deducible
- default button
- default clause
- default drive
- default file
- default font
- default label
- default program
- default reasoning
- default zone
- defective value
- deferred address
- deferred entry
- damper tube
- dangling node
- dark resistance
- darkest
- Darlington amplifier
- dash
- data break
- data card
- data cartridge
- data cleaning
- data compression
- data constellation
- data content
- data corruption
- data density
- data disc
- data division
- data error
- data host
- data instance
- data item
- data layout
- data loss
- data masking
- data originator
- data path
- data plotter
- data purification
- data queue
- data rate
- data receiver
- data record
- data register
- data resource
- data retrieval
- data rounding
- data security
- data sink
- data space
- data statement
- data storage
- data string
- data tag
- data tendency
- data tracking
- data trend