a po - acti
- a posteriori probability
- a priori information
- a priori probability
- A-battery
- A-bomb
- A-bomb burst
- A-bomb explosion
- A-waste
- A2B6 compound
- A3B5 compound
- Abbe condenser
- Abbe number
- Abbe prism
- Abbe refractometer
- Abel equation
- Abelian algebra
- Abelian case
- Abelian charge
- Abelian coupling
- Abelian differential
- Abelian field
- Abelian flux
- Abelian gauge theory
- Abelian group
- Abelian integral equation
- Abelian invariance
- Abelian manifold
- Abelian model
- Abelian particle
- Abelian photon
- Abelian representation
- Abelian symmetry
- Abelian system
- Abelian theory
- Abelian transform
- Abelian transformation
- abelianization
- aberration
- aberration compensator
- aberration constant