- answering equipment
- answering machine
- antae
- antapex
- antenna adapter
- antenna array
- antenna cable
- antenna effect
- antenna feeder
- antenna loop
- anthracene
- anthracite
- anthropography
- anthropometrical requirements
- anti septic
- anti slipping
- anti-aliasing
- anti-corrosion
- anti-dazzle
- anti-derivative
- anti-icing
- anti-jamming
- anti-parallel
- anti-phase
- anti-seepage
- angle bender
- angle bond
- angle dip
- angle dozer
- angle fillet
- angle gauge
- angle lever
- angle rafter
- angle rake
- angle strain
- angstrom
- angular acceleration
- angular deflection
- angular displacement
- angular distance
- angular error
- angular frequency
- angular instrument
- angular measurement
- angular milling
- angular motion
- angular position
- angular speed
- angular test
- angular width
- angulator
- anharmonic resonance
- anholonomic
- anhydrous gypsum
- anhydrous lime
- animal glue
- animatronics
- anisotropic magnet
- annals
- annealing
- annealing color
- annealing oven
- annex memory
- annihilation
- anniversaries
- annotate
- annotation
- announce
- annual flow
- annual leave
- annual precipitation
- annual rainfall
- annual report
- annual reservoir
- annual ring
- annular arch
- annular gap
- annular space
- annunciation
- anode
- anode layer
- anode ray
- anode rectification
- anode shield
- anodmia
- anomalous refraction
- anomaly
- anonymity
- anonymous user
- Anosov flow
- ansa
- answer back
- answer tone
- answerable
- anta
- antacid
- ammonia solution
- ammonia spirit
- ammonia valve
- ammonia vapour