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- apeirogon
- APEL
- ApEn
- Apennines crater
- A Perfect Diurnall of the Passages in Parliament
- A Performance Scroll of a Hero and a Beauty
- aperiodic
- aperiodic attractor
- aperiodic automorphism
- aperiodic comet
- aperiodic crystal
- aperiodic endomorphism
- aperiodic ergodic class
- aperiodic function
- aperiodic group
- aperiodicity
- aperiodic monoid
- aperiodic motion
- aperiodic speed fluctuation
- aperiodic state
- aperiodic stochastic matrix
- aperiodic tiling
- A Person Living with HIV
- aperture
- aperture aberration