- athletic arena
- athletic hall
- atmospheric condenser
- application program
- application techniques
- applied art
- applied mathematics
- apply
- Appointed Bidder
- appraisal
- appreciate
- approach grade
- approach ramp
- approach roadway
- approach viaduct
- approaches
- appropriate
- approving authorities
- approximate load
- approximation
- apron rail
- apsidal
- apsis
- aquatorium
- aqueduct trough
- aqueous emulsion
- arc-boutant
- arcade
- arcature
- arch bar
- arch bridge
- arch culvert
- arch girder
- arch ring
- arch stone
- arch timbering
- arched girder
- arched roof
- arched window
- archeology
- architectonics
- architectural archaeology
- architectural decor
- architectural detail
- architectural drawing
- architectural ergonomics
- architectural hardware
- architectural landscape
- architectural milieu
- architectural office
- architectural perspective
- architectural prototype
- architectural restoration
- architectural space
- architectural study
- architectural volume
- architecture
- arcuate
- area wall
- argillaceous
- arithmetical mean
- armature
- armored door
- armored switch
- armory
- armoured glass
- armouring
- arrested
- arrow
- arsenal
- art glazier
- artesian
- artesian spring
- articulated support
- articulated trailer
- artificial aggregate
- artificial asphalt
- armored blind
- armoured plywood
- arrange icon
- arrangement
- arrears
- arris fillet
- arris tile
- arson
- art foundry
- artel
- arterial highway
- artificial bitumen
- artificial nourishment
- artificial resin
- artificial soil
- asbestine tile
- asbestos blanket
- asbestos cement
- asbestos fibre
- asbestos grade
- asbestos mine
- asbestos packing
- asbestos wallboard