- diagonal strut
- diagonalizable
- diagonalized
- diagram paper
- diagrammatic representation
- dial back
- dial jacks
- dial line
- dial tone
- dialect
- dialed line
- dialing key
- dialog box
- dialog sheet
- dialogue
- diametral curve
- diametral plane
- diaphragm
- diaphragm dam
- dibit
- dichotomizing search
- dichotomous population
- dichotomy
- dictionary code
- differ
- difference formula
- difference method
- difference quotient
- differential analyse
- differential calculus
- differential class
- differential expression
- differential gauge
- differential invariant
- differential phase
- differential polynomial
- diffuse reflection
- diffused capacitor
- diffusion length
- diffusion process
- digamma
- digit
- digit check
- digit counter
- digit filter
- digit layout
- digit position
- digit pulse
- digit selector
- digital audio
- digital authentication
- digitize
- digitized audio
- digitized video
- digitizer
- digitizing pad
- digitizing software
- digitizing tablet
- digram
- digraph
- dihedral group
- dihedron
- dihomology group
- dilatation
- dilatation ratio
- dilate
- dilation
- dilemma
- dilution
- dimension
- dimension attribute
- dimension specification
- dimensional
- dimensional unit
- dimensionality
- dimensionally
- dimensioning
- dimensionless
- dimetric
- diminished
- diminution
- dingbat
- diode bridge
- diode detector
- diode gate
- diode logic
- diode matrix
- diode mixer
- diode probe
- diode rectifier
- diode switch
- diode voltage
- diophantine approximation
- dip
- dip stick
- DIP switch
- depress
- depressed
- depression
- depression wave