- Apple key
- Apple menu
- applet viewer
- applicability
- applicable
- application
- application audit
- application centric
- application development
- application heap
- application icon
- application inverse
- application layer
- application mode
- application ouverte
- application part
- application problem
- application services
- application software
- application windows
- application-oriented
- applicative language
- apply design
- approach
- approach light
- approximability
- approximate construction
- approximate convergence
- approximate equation
- approximate evaluation
- approximate method
- approximate solution
- approximate value
- approximation algorithm
- approximation process
- approximative calculus
- arbitrarily near
- arbitration
- arbor
- arch stress
- Archimedes
- architectural drafting
- archival quality
- archive
- archive science
- archived element
- archives
- arcolar derivative
- area
- area boundary
- area computation
- area function
- areal density
- argument range
- application association
- application driven
- application file
- application host
- application management
- application package
- application processor
- application routine
- appropriate priviledges
- approval log
- approximate derivative
- approximately
- apside
- arbitration level
- arbitrator
- arc length
- arch bond
- archival medium
- archive attribute
- archived file
- archiver
- arcsine distribution
- area-preserving
- areal coordinates
- areal metric
- argue
- argument keyword
- argument separator
- arithlog diagram
- arithmetic address
- arithmetic code
- arithmetic computer
- arithmetic equation
- arithmetic flowchart
- arithmetic mean
- arithmetic statement
- arithmetic term
- arithmetic unit
- arithmetical operation
- arithmetization
- arithmometer
- array declaration
- array pitch
- array processor
- array theory
- array-valued