a-battery - adobe soil
- actuation time
- actuator
- acute angle
- acute arch
- acute irradiation
- acute triangle
- acute-angled triangle
- acyclic machine
- acylate
- acylating
- acymptotic distribution
- adamantine
- adamantine drill
- adapter bearing
- adapter coupling
- adapter sleeve
- adapting of dynamic subroutine
- adapting pipe
- adaptive metallurgy
- adaptive system
