| Term | Definition |
| adulterate | to contaminate, to make impure |
| adverse | unfavorable, antagonistic |
| aesthetic | having to do with artistic beauty, artistic |
| affable | easy to talk to, friendly |
| affectation | unnatural or artificial behavior, usually intended to impress |
| affinity | sympathy, attraction, kinship, similarity |
| affluent | rich, prosperous |
| aggregate | sum total, a collection of separate things mixed together |
| agnostic | one who believes that the existence of a god can neither be proven nor disproven |
| agrarian | relating to land, relating to the management or farming of land |
| alacrity | cheerful eagerness or readiness to respond |
| allege | to assert without proof |
| alleviate | to relieve, usually temporarily or incompletely, to make bearable, to lessen |
| allocate | to distribute, to assign, to allot |
| alloy | a combination of two or more things, usually metals |
| allusion | an indirect reference (in books), a hint |
| aloof | uninvolved, standing off, keeping ones distance |
| altruism | selflessness, generosity, devotion to the interests of others |
| ambience | atmosphere, mood, feeling |
| ambiguous | unclear in meaning, confusing, capable of being interpreted in different ways |
| ambivalent | undecided, having opposed feelings simultaneously |
| ameliorate | to make better or more tolerable |
| amenable | obedient, willing to give in to the wishes of another, agreeable |
| amenity | pleasantness, attractive or comfortable feature |
| amiable | friendly, agreeable |
| amnesty | and official pardon for a group of people who have violated a law or policy |
| amoral | lacking sense of right and wrong, neither good nor bad, neither moral nor immoral, without moral feelings |
| amorous | feeling loving, especially in a sexual sense, in love, relating to love |
| amorphous | shapeless, without a regular or stable shape, blob-like |
| anachronism | something out of place in time or history, and incongruity |
| analogy | a comparison of one thing to another, similarity, |
| al/ali/alter | other, another |
| am | love |
| a | without |
| amb/amph | around |
| amph/amb | both |