- Absorption, Photon
- Acceleration
- Acoustic Impedance
- Adiabatic Process
- Aharonov–Bohm Effect
- Airy Disk
- Albedo
- Alpha Decay
- Ampere’s Law
- Amplitude Modulation (AM)
- Andromeda Galaxy
- Angular Momentum
- Angular Velocity
- Anisotropy
- Anode
- Antimatter
- Archimedes’ Principle
- Astigmatism
- Astronomical Units
- Atmosphere
- Atomic Clock
- Atomic Structure
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