- Ate
- Atheist
- Atlas
- Atoll
- Atomic energy
- Attendants
- Attended by
- Attendees
- Attender
- Attested milk
- Attire
- Attorneys
- Attract
- Attraction
- Attune
- Aureus
- Auricle
- Auspices
- Autarchy
- Authentically
- Authorative person
- Authorial
- Authorise
- Autoradiograph
- Autosomal chromosome
- Autotrophic
- Auxiliary bishop
- Availability
- Available resources
- Avarice
- Avenue
- Averse
- Aviation
- Aviatrix
- Aviculture
- Axiomatic
- Axis neutral
- Axle
- Ayodhya
- Azoic
- Absolvable
- Air
- 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
- 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
- According to schedule
- Accoucheuse
- Account
- Account for
- Accountability
- Accountable
- Accounting
- Accounts
- Accoutrements
- Accredit
- Achievement quotient
- Achilles heel
- Aching
- Achy
- Acid test