- Affinity with (for, between)
- Affix
- Affluenza
- 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
- 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
- Amethyst
- Amicably
- Amicue curie
- Amidst
- Amoeba
- An acquatic plant
- An arrow
- An either or situation
- An electuary
- An expiatory spell
- An ignoramous
- An iron hand in a velvet glove
- An ornament
- An ornament for the neck
- Anabasis
- Anatomize
- Anchorman
- Ancient
- Ancient times
- And that
- Andaman island
- Andragogy
- Androecium
- Andrology
- Angst
- Angular
- Angular diameter
- Aniconism
- Animal kingdom
- Animistic
- Anise seed
- Anise seed herb
- Annexe
- Another
- Anothers wife
- Ansi
- Antagonize
- Antarctic
- Ante
- Anvil
- Anxiously
- Any eye-salve