- At any moment
- At every turn
- At first light
- At first sight
- At great length
- At least
- At most
- At night
- At odds
- At this rate
- At time
- At war
- Atavism
- Ate
- Atheist
- Atlas
- Atoll
- Atomic energy
- Aubade
- Auberage
- Aubergine
- Aubum hair
- Auction
- Auctionary
- Audience
- Audio
- Audio-visual aids
- Auditory ossicles
- Augean stables
- Augmentation
- Augur
- Augury
- Authoritatively
- Authority
- Authorization
- Authorized
- Autism
- Auto-typography
- Autochthons
- Autocrat
- Autograph
- Automatic dictionary
- Automatic pagination
- Automatism
- Await
- Awaiting
- Awake to
- Awake to reality
- Awareness
- Awash
- Awful
- Awkward age
- Awl
- Ax
- Axe helve
- Axiom
- Altaltissimo
- Ark
- Astron
- Ataxia, ataxia
- a bag of bones
- A bed roses
- A bird in a golden cage
- A bit
- A black sheep
- A black-leg
- A blank look
- A bull in a china shop
- A bun in the oven
- A capella
- A chorus of thanks
- A cold sweat
- A cubit
- 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
- A long gasp
- A long time
- A magnetic personality
- A man of substance
- A man of the people
- A man ofwords
- A medicinal grass
- A morsel
- A nervous wreck
- A one parent family
- A page in history
- A patent lie
- A raw deal
- A real man
- A sacred poetical work
- A sadder and wiser man
- A sealed book