| approbation | Approval or praise, often in an official sense | |
| apposite | Apt in the circumstances or in relation to something | |
| apportion | Divide and allocate | |
| appease | To bring peace, quiet, or calm to; soothe | |
| apotheosis | The highest point in the development of something; a culmination or climax | |
| apothegm | A concise saying or maxim; an aphorism | |
| apostle | A vigorous and pioneering advocate or supporter of a particular policy, idea, or cause | |
| apoplectic | Overcome with anger; extremely indignant | |
| apocryphal | A story or statement of doubtful authenticity, although widely circulated as being true | |
| aplomb | Self-confidence or assurance, especially when in a demanding situation | |