| Term | Definition |
| allocate | to distribute, set aside |
| aloof | reserved, distant |
| altercation | a dispute, fight |
| amalgamate | to bring together, unite |
| ambiguous | uncertain, variably interpretable |
| ambivalent | having opposing feelings |
| ameliorate | to improve |
| amenable | willing, compliant |
| amenity | an item that increases comfort |
| amiable | friendly |
| amicable | friendly |
| amorous | showing love, particularly sexual |
| amorphous | without definite shape or type |
| anachronistic | being out of correct chronological order |
| analgesic | something that reduces pain |
| analogous | similar to, so that an analogy can be drawn |
| anarchist | one who wants to eliminate all government |
| anathema | a cursed, detested person |
| anecdote | a short, humorous account |
| anesthesia | loss of sensation |