| Term | Definition |
| agnostic | one who is skeptical of the existence or knowability of a god or any ultimate reality |
| alacrity | cheerful promptness |
| alienate | make hostile; separate |
| allay | to calm |
| allege | state without proof |
| alleviate | to relieve |
| allocate | assign |
| allure | entice; attract |
| altercation | wordy quarrel |
| altruistic | unselfishly generous; concerned for others |
| ambience | environment; atmosphere |
| ambivalence | the state of having contradictory or conflicting emotional attitudes |
| ameliorate | improve |
| amenable | readily managed; willing to be led |
| ambiguous | unclear or doubtful |