- abolition
- anestrum
- amyxia
- anoestrum
- anhidrosis
- anoestrus
- agalactosis
- angiotelectasia
- anhydrosis
- affricate
- affricative
- affricate consonant
- an increment
- abettal
- abetment
- an employment
- ablution
- armed service
- anntenna
- avirulent
- actuality
- anabiosis
- acute schizophrenic episode
- all too
- a square meal
- a sticky wicket
- a roar (in rage)
- attenuation constant
- attenuation distortion
- attenuation loss
- attrition rupture
- anomie
- anomy
- amplification factor
- amplexicaul leaf
- amphitheatric
- Agent Orange
- atrazine
- articles placed in advance at the auspicious moment in the direction in which one is to journey (in case one's departure is delayed due to some reason)
- a sense of occasion
- a shadow of former self
- Andvari
- advect
- antediluvial
- Atlantic moonfish
- appositively
- asio otus
- adonivernoside
- adonis vernalis
- anamirta paniculata