- annul
- annular area
- anode grounding
- anodic oxidation
- anodizing
- antae
- antenna masy
- anthemion
- anthology
- anthophyllite
- anti-frictional
- anti-seepage
- angle bond
- angle brace
- angle buttress
- angle cleat
- angle fitting
- angle focus
- angle halving
- angle lacing
- angle pulley
- angle rafter
- angle rib
- angle section
- angle staff
- angle stile
- angle structure
- angle templet
- angled stair
- angry
- angular amplitude
- angular deflection
- angular dimension
- angular measurement
- angular particle
- angular rate
- angular sand
- angular transformation
- anhydrite cement
- anhydrous gypsum
- anhydrous lime
- anhydrous plaster
- animal grease
- animal shed
- animated cartoon
- animated street
- anionic emulsion
- anionization
- anisotropic body
- anisotropic shell
- anisotropy
- annealed steel
- annealing
- announcer cabin
- annual amortization
- annual report
- annual ring
- annuciator
- annular bit
- annular girder
- annulet
- annulus seal
- anobium borer
- anode corrosion
- anomaly
- answerable
- anta
- ammonite
- ammonium phosphate
- ammonium sulphate
- amorphism
- amorphous
- amortizement
- amphibious shovel
- amphibious site
- amphistyle
- amphitheatre
- amplification seismograph
- amplitude resonance
- amplitude sound
- amusement park
- anaerobic process
- analectic
- analog design
- analog-composite
- analysis
- analytical dynamics
- analytical scale
- ancestral temple
- anchor
- anchor block
- anchor column
- anchor cone
- anchor head
- anchor nut
- anchor pile
- anchor screw
- anchor set
- anchor sliding
- anchor slipping