- Aerobatics
- Aeronautical
- Aerospace
- Affectation
- Afghan
- Afghan hound
- Aforesaid
- Afresh
- Africa
- Aft
- After mentioned
- After pains
- After-effects
- Aftereffect
- Afternoon
- Afters
- Aggressive
- Agitator
- Aglow
- Agog
- Agonising
- Agonizingly
- Agree
- Agree to
- Agree with
- Agreeably
- Air frieght
- Air rifle
- Air service
- Air speed
- Air-conditioning
- Air-cushion
- Air-sea rescue
- Air-to-air
- Airbus
- Aircraft carrier
- Aircraftman
- Alas
- Alas!
- Albion
- Alcoholism
- Alcove
- Ale
- Alexander
- Alga
- Algonquin
- All over
- All person
- All right
- All star
- All such
- All the way
- All time
- All-pervading
- All-purpose
- All-wise
- Allayment
- Amatory
- Along with
- Alpha
- Alphanumeric
- Also-ran
- Alstonia scholaris
- Amazing
- Ambergris
- Amberite
- Ambidextrous
- Ambience
- Ambiguity
- Ambivalence
- Ambulance
- Amelioration
- Amendment
- Amorphism
- Amorphophallus paeoniifolius
- Amour
- Amour propre
- Amp
- Ampacity
- Ampadi
- Ampersand
- Amphibian
- Amphibious
- Amphorae
- Amputed arm
- Amputee
- Amusedly
- Anatomize
- Anchorman
- Ancient
- Ancient times
- And that
- Andaman island
- Andragogy
- Androecium
- Andrology
- Angst
- Angular
- Angular diameter
- Aniconism