| Term | Definition |
| amphibious | able to live on both land and water |
| ample | abundant |
| amplify | to make larger or greater |
| amulet | a charm worn to keep away evil |
| anachronism | something out of place or time |
| analgesic | drug that relieves pain |
| analogy | similarity or comparison |
| anarchy | absence of government |
| anathema | a curse |
| ancillary | helping |
| anecdote | a short, entertaining story |
| anent | regarding |
| anguish | great suffering or grief |
| anhydrous | without water |
| animadversion | criticism |
| animate | to give life to |
| animosity | hostility |
| animus | hostile feeling |
| annals | historical record |
| anneal | to heat and then cool |