- aquosity
- araeostyle
- aragonite limestone
- arbitrator
- arc cutting
- arc doubleau
- arc voltage
- arcade court
- arch
- arch action
- arch cover
- arch door
- arch form
- arch sagging
- arch spillway
- arch thrust
- arch truss
- arched buttress
- arched floor
- arched principal
- arching
- architectonic
- architectural aesthetics
- architectural concrete
- architectural decoration
- architectural dismemberment
- architectural examination
- architectural illumination
- architectural monument
- architectural order
- architectural psychology
- architectural sketch
- architectural stereotype
- architectural tectonics
- archivolt
- archway
- archy
- arcuate architecture
- area efficiency
- arenaceous dolomite
- argilization
- argillaceous marl
- argue
- arise
- arithmetic projection
- armour plate
- armoured cable
- armoured wood
- armoury
- army workshop
- arrange all
- arris rail
- art gallery
- arterial traffic
- artesian head
- artesian well
- artgum eraser
- articulated pipe
- articulated system
- artificial ageing
- artificial anhydrite
- artificial gas
- artificial seasoning
- asbestos
- asbestos cardboard
- asbestos crushing
- asbestos mix
- asbestos plaster
- ascending
- ascending mining
- aseismic joint
- ash door
- ash grate
- ashlar
- ashlar pier
- aslar masonry
- aspect
- asphalt felt
- asphalt mattress
- asphalt overlay
- asphalt powder
- asphalt varnish
- asphalt works
- asphaltum varnish
- assembler
- assembly axis
- assembly hall
- assembly language
- assembly operation
- assembly space
- assembly wire
- asset management
- assimilation
- assistant engineer
- astel
- astylar
- asymmetric truss
- asymmetrical load
- asynchronism
- atectonic