- Affright
- Affront
- Affronted by
- Afterthought
- Again
- Against the grain
- Against the hair
- Agamas
- Agate
- Age
- Age of shams
- Aged bull
- Ageism
- Agency
- Agent
- Ages
- Agglutinate
- Airsickness
- 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
- Alignment
- Alimony
- Alive and kicking
- Alkali ash
- All -in
- All and sundry
- All around
- All at once
- All for
- All his geese are swans
- All important
- All night
- All one
- Allergic
- Allergic to
- Alley
- Alleyway
- Allied
- Alligator
- Alliteration
- Allopathic
- Allot
- Allow in
- Allowable
- Allowed
- Alloy
- Allure
- Alluring
- Allusion
- Altered
- Alternately
- Alternating current
- Alternation
- Alternator
- Altitude
- Altruism
- Altruistic
- Alu
- Alumna
- Alumnus
- Alzheimer's disease
- Amalgamation
- Amassed
- Amative
- Amethyst
- Amicably
- Amicue curie
- Amidst
- Amoeba
- Amorphism
- Amorphophallus paeoniifolius
- Amour