| Term | Definition |
| abate | to reduce in amount, degree, or severity |
| abscond | to leave secretly |
| abstain | to choose not to do something |
| abyss | an extremely deep hole |
| adulterate | to make impure |
| advocate | to speak in favor of |
| aesthetic | concerning the appreciation of beauty |
| aggrandize | to increase in power, influence, and reputation |
| alleviate | to make more bearable |
| amalgamate | to combine, to mix together |
| ambiguous | doubtful or uncertain; able to be interpreted in several ways |
| ameliorate | to make better; to improve |
| anachronism | something out of place in time |
| analogous | similar or alike in some way; equivalent to |
| anomaly | deviation form what is normal |
| antagonize | to annoy or provoke to anger |
| antipathy | extreme dislike |
| apathy | lack of interest or emotion |
| arbitrate | to judge a dispute between two opposing parties |
| archaic | ancient, old-fashioned |
| ardor | intense and passionate feeling |
| articulate | able to speak clearly and expressively |
| assuage | to make something unpleasant less sever |
| attenuate | to reduce in force or degree; to weaken |
| audacious | fearless and daring |
| austere | severe or stern in appearance; undecorated |