- accidental eccentricity
- accompany
- accordion partition
- account statement
- account valuation
- accountant general
- accretion
- accumulate
- accumulation register
- accumulative relief
- accumulator capacity
- accumulator traction
- acetal
- acetylene cylinder
- acetylene headlight
- acetylene welding
- achromatic light
- achromatic radiation
- acid brick
- acid corrosion
- acid reduction
- acid resistance
- acids room
- accumulated discrepancy
- accumulation curve
- accumulation hill
- accumulator
- accuracy rate
- acentric
- acetylene plant
- acid fermentation
- acid fume
- acid mordant
- acid polishing
- acid washing
- acolian soil
- acoumeter
- acoustic absorptivity
- acoustic barrier
- acoustic bridge
- acoustic broad
- acoustic casing
- acoustic ceiling
- acoustic comfort
- acoustic construction
- acoustic enclosure
- acoustic feedback
- acoustic filter
- acoustic materials
- acoustic permeability
- acoustic plaster
- acoustic reflectivity
- acoustic resonance
- acoustic screening
- acoustic shock
- acoustic transmissibility
- acoustical absorptivity
- acoustical cloud
- acoustical plaster
- acoustical reactivity
- acoustical sheeting
- acoustical tile
- acred league
- acronym
- across grain
- acrylic resin
- acrylonitrile
- action argument
- action bar
- activate
- activated carbon
- activated charcoal
- activated clay
- activated mortar
- activating object
- activation
- activator
- active
- active area
- active coating
- active control
- active crack
- active face
- active form
- active gauge
- active ingredient
- active layer
- active leaf
- active materials
- active pile
- active process
- active vibroinsulation
- active wedge
- activity
- activity code
- Activity rate
- actual cost
- actual damage
- actual deflection
- actual diameter