- Atmosphere
- Atom
- Atomic
- Atomic number
- Attendant
- Attending
- Attentive
- Attestation
- Attractiveness
- Atwitter
- Au courant
- Aunt
- Aureate
- Aurora
- Auster
- Austere
- Auteur
- Authenticate
- Authentication
- Authorised
- Authoritarianism
- Authoritative
- Autopsy
- Autotype
- Autumn
- Avacado
- Avarise
- Aver
- Average
- Avid
- Avidly
- Aviform
- Axle-tree
- Azolla
- Azure
- Altaltissimo
- Ark
- Astron
- Ataxia, ataxia
- A dirty trick
- A divine bird born of aruna and syeni
- A dog's death
- A figure of speech in which an indirect theme adduces to the direct
- A flower tree
- A forestation
- A founding father
- A fractuary
- A friend in need is a friend indeed
- A gamogenesis
- A good number of
- A good or great while
- A good second
- A good sort
- A hard life
- A herb
- A herb conceived as being capable of bringing the dead to life
- A large number
- A late hour
- A long face
- A raw deal
- A real man
- A sacred poetical work
- A sadder and wiser man
- A sealed book
- A short tripod
- A small drum
- A small fry
- Abaft
- Abalienate
- Abasement
- Abatement
- Abatement of rain
- Abating
- Abbess
- Abduct
- Abe
- Abecedarian
- Abominate
- Aborti-facient
- Abortionist
- Abound
- Abounding
- Above all
- Above criticism
- Absentee
- Absolute address
- Absolute control
- Abstain from
- Abstaining
- Abstention from buying
- Abstention from condemning
- Abstinence
- Abstinence from eating and drinking
- Abstinent
- Abstracted
- Accompany
- Accomplishing
- According
- According to
- According to ones lights