| Term | Definition |
| accessible | obtainable, reachable |
| acclaim | high praise |
| accolade | something given as a special honor or in recognition of merit |
| accommodating | helpful, obliging, polite |
| accord | an agreement |
| accost | to approach, confront verbally |
| accretion | slow growth in size or amount |
| acerbic | 1. sharp and forthright, 2. bitter in tone or taste |
| acquiesce | to agree without protesting |
| acrimony | bitterness, discord |
| acumen | keen insight |
| acute | sharp, severe |
| adamant | impervious, immovable, unyielding |
| adept | extremely skilled |
| adhere | to stick to something |
| admonish | to caution, criticize, reprove |
| adorn | to decorate |
| adroit | skillful, dexterous |
| adulation | extreme praise |
| adumbrate | to sketch out in a vague way |