A
- Accelerator effect (economics)
- Accordion effect (physics) (waves)
- Acousto-optic effect (nonlinear optics) (waves)
- Additive genetic effects (genetics)
- Aharonov–Bohm effect (quantum mechanics)
- Alienation effect (acting techniques) (Bertolt Brecht theories and techniques) (film theory) (metafictional techniques) (theatre)
- Allais effect (fringe physics)
- Allee effect (biology)
- Ambiguity effect (cognitive biases)
- Anrep effect (cardiology) (medicine)
- Antenna effect (digital electronics) (electronic design automation)
- Anti-greenhouse effect (atmospheric dynamics) (atmospheric science) (astronomy) (planetary atmospheres)
- Askaryan effect (particle physics)
- Asymmetric blade effect
- Audience effect (psychology) (social psychology)
- Auger effect (atomic physics) (foundational quantum physics)
- Aureole effect (atmospheric optical phenomena) (scientific terminology)
- Autler–Townes effect (atomic, molecular, and optical physics) (atomic physics) (quantum optics)
- Autokinetic effect (vision)
- Avalanche effect (cryptography)
- Averch–Johnson effect (economics)
Read more about this topic: List Of Effects