arc - auxi
- assayer
- assaying
- Assel elongator
- Assel mill
- assembling department
- assembling die
- assembly
- assembly of particles
- assembly system
- assignable cause
- assignment of indices
- Assn
- associated equipment
- associated minerals
- association effect
- association equilibrium
- Association Internationale pour les Recherches de Base au Haut Fourneau
- association linkage
- Association of American Steel Manufacturers
- Association of Bronze and Brass Founders
- association of dislocations
- assorting
- assorting room
- AST
- astatic magnetometer probe
- astatine
- astern running
- Aston process
- asymmetric double-vee groove
- asymmetric line broadening
- asymmetric method of film mounting
- asymmetrical beam
- asymmetrical line profile
- asymmetrical mode
- asymmetry of lines
- asymmetry potential
- asymptotic curve
- at make
- at.
- At.