- Autograph
- Automatic dictionary
- Automatic pagination
- Automatism
- Autoradiograph
- Autosomal chromosome
- Autotrophic
- Auxiliary bishop
- Availability
- Available resources
- Avarice
- Avenue
- Averse
- Aviation
- Aviatrix
- Aviculture
- Axiomatic
- Axis neutral
- Axle
- Ayodhya
- Azoic
- Absolutist
- Aero
- A good or great many
- A hen party
- A herb with the smell of camphor
- A historical
- A hollow laughter
- A la
- A labour of love
- A little only
- Abacus
- Abandoning
- Abase
- Abashing
- Abashment
- Abatement of sickness
- Abbreviate
- Abc
- Abcess
- Abdicate
- Abdication
- Abduction
- Abed
- Abend
- Above price
- Abracadabra
- Abracos
- Abrade
- Abrading
- Abrandant
- Abrasively
- Abrasiveness
- Abreast
- Abridged
- Abrupt
- Abruptness
- Abscond
- Absconded out
- Absconding
- Abseil
- Absence
- Absent
- Axilla
- Absurd
- Absurdism
- Absurdity
- Abundantly
- Abused
- Abutting
- Abysmal
- Ac
- Acc
- Accelerated
- Acceleration
- Accompanist
- Accord
- According as
- Accountancy
- Accountant
- Accoutre
- Accoutrement
- Accreditation
- Acetylene
- Acheron
- Achievable
- Achieve wonders
- Achieved
- Achievement
- Achromatic
- Achyranthus aspera
- Acia
- Airsick
- Acidify
- Acme
- Aconite
- Acquaintance
- Actualist
- Actuarial
- Actuary