- Alum
- Always
- Am
- Amalgamate
- Amateur
- American football
- American indian
- Americanism
- Americium
- Amerindian
- Amiability
- Amiableness
- Amicus curiae
- Amid
- Ammunition
- Amniocentesis
- Among
- Amorality
- Amusements
- An
- An abuse
- An agonist
- An arm and a leg
- An ascetic
- An ayurvedic treatment
- An edible snail
- An even chance
- An item in phyrotechnics
- An oil-press
- An old head on young shoulders
- Anatomist
- Anatomy
- Ancestor
- Ancestry
- Ancient story
- Ancillary
- And a half
- And that's flat
- And the like
- And then
- And things
- And what is more
- Andirons
- Androcentricity
- Andropause
- Anecdote
- Anemia
- Anencephalus
- Anent
- Anesthetic
- Anesthetist
- Aneurysms
- Anger
- Angina
- Angiras
- Anglicize
- Angling
- Anglo
- Anglophone
- Angora
- Angry
- Annihilated
- Annihilation
- Annualized
- Annuity
- Annus mirabilis
- Anodise
- Anomalous
- Anonym
- Anus
- Anonymous letter
- Anorexic
- Another key
- Answer back to
- Answer for
- Antechamber
- Antennae
- Antepenultimate
- Anticipation
- Anticipative
- Antihelmintic
- Antihistamines
- Antilog
- Antilogarithm
- Antimacassar
- Antinomy
- Antiquity
- Antithesis
- Antithetical
- Antitype
- Antral gastritis
- Aphorism
- Apiculture
- Aplomb
- Apocalypse
- Apollo
- Apologetic
- Apologia
- Apologise
- Apologist