- arrestment
- arrival
- arterial drain
- arterial highway
- article
- articulate
- articulated suspension
- articulation testing
- artificial atmosphere
- artificial climate
- artificial harbour
- artificial language
- artificial manure
- artificial resin
- artificial sand
- artificial soil
- asbestine tile
- asbestos tile
- ascend
- ascendant
- ascender
- ascending key
- ascending line
- ascending sort
- ascending working
- ascensional power
- ascent resistance
- aschistic rock
- ascribe
- ash content
- ash furnace
- ash percentage
- ash-pit
- ashes
- ask
- askew arch
- aspect angle
- asphalt concrete
- asphalt distributor
- asphalt grouting
- asphalt macadam
- asphalt paint
- asphalt paving
- asphalt sheet
- asphaltic
- asphaltic resin
- asphalting air
- asphyxiation
- aspirating burner
- aspiration cover
- assanation
- assay
- assemble duration
- assembling
- assembly
- assembly plant
- assembly shop
- assess
- assets
- assign
- assigned frequency
- assignment instruction
- Assignment problem
- assignment symbol
- assimilate
- assistant director
- associated storage
- associative processing
- assumed
- assumed load
- assumed value
- assumption
- assurance coefficient
- Artificial Life
- artificial magnet
- artificial monument
- artificial refrigeration
- artificial satellite
- artistry
- artwork
- asbestos fabric
- asbestos shingle
- asbestos yarn
- ascending sequence
- ascension
- ascent
- aseismic
- aseismic structures
- ash
- ash layer
- ash-tray
- ashlar masonry
- ashy
- askew bridge
- aspergillus
- asphalt
- asphalt grout
- asphalt shingle
- asphalted paper
- asphaltic concrete