- a block
- A derrick
- A-1 level
- A-frame
- a-pillar
- a-pole
- A-pylon
- abacus
- abat-voix
- abatement
- abbreviated dialing
- ability
- abnormal
- abnormal soil
- aboriginal
- about
- above
- above normal
- abraded glass
- abrased glass
- abrasion coefficient
- Abrasion Damage
- abrasion hardness
- abrasion resistance
- abrasion test
- abrasive disc
- abrasive dust
- abrasive tools
- abrasive wear
- abrasives
- abreuvoir
- abrupt
- abrupt changes
- absolute accumulation
- Absolute advantage
- absolute altitude
- absolute deformation
- absolute displacement
- absolute movement
- absolute point
- absolute trajectory
- absolute zero
- absorbability
- absorbance
- absorber shock
- absorbing well
- absorption
- absorption bed
- absorption column
- absorption factor
- absorption loss
- absorption pit
- absorption rate
- absorption unit
- abstemious
- abstract
- abt track
- abut
- abut siding
- abutment
- abyssal plain
- academician
- acanthus
- acarology
- acceberated weathering
- accelerated ageing
- accelerated consolidation
- accelerating pump
- acceleration lane
- accelerator pedal
- accent lighting
- accentuation
- acceptance certificate
- acceptance regulations
- acceptance specification
- acceptance test
- access arm
- access balcony
- access corridor
- access cover
- access door
- access floor
- access ramp
- access well
- accessory room
- accident report
- accidental
- accidental air
- accidental load
- accommodating load
- accommodation hut
- accordion blind
- account
- account period
- accountant
- accumulated distance
- accumulation fund
- accumulative crystallization
- accumulative shore
- accumulator car