| Term | Definition |
| affected | phony, artificial |
| aggregate | a collective mass, the sume total |
| algorithm | an established procedure for solving a problem or equation |
| alimentary | pertaining to food, nutrition, or digestion |
| allay | to lessen, ease, reduce in intensity |
| amity | friendship, good will |
| amorphous | having no definite form |
| animus | a feeling of animosity or ill will |
| anodyne | a source of comfort; a medicine that relieves pain |
| anomaly | a deviation from the common rule, something that is difficult to classify |
| anthromorphic | suggesting human characteristics for animals and inamiate things |
| antiquated | too old to be fashionable or useful |
| aphorism | a short statement of a principle |
| aplomb | self-confident assurance; poise |
| apostate | one who renounces a religious faith |
| apposite | strikingly appropriate or well adapted |
| apprise | to give notice to, inform |
| appropriate | to assign to a particular purpose, allocate |
| arable | suitable for cultivation |
| arcane | secret, obscure; known only to a few |
| archipelago | a large group of islands |
| arrears | unpaid, overdue debts or bills; neglected obligations |
| arrogate | to claim without justification; to claim for oneself without right |
| askance | with disapproval; with a skeptical sideways glance |
| assent | to agree, as to a proposal |