| A | B |
| aspire | seek to attain; long for |
| assail | assault |
| assert | state strongly or positively; insist on or demand recognition of (rights, claims,etc) |
| assiduous | diligent |
| assuage | ease or lessen (pain) |
| assumption | something taken for granted; taking over or taking possession of |
| assurance | promise or pledge; certainty; self-confidence |
| astute | wise; shrewd; keen |
| asylum | place of refuge; safety |
| atrophy | waste away |
| attain | reach or accomplish; gain |
| attentive | watching carefully; considerate; thoughtful |
| attribute | ascribe or credit (to a cause); regard as characteristic of a person or thing; essential quality |
| attrition | gradual decrease in numbers; reduction in work force without firing employees; wearing away opposition by means of harassment |
| audacity | boldness |
| augment | increase |
| auspicious | favoring success; fortunate |
| austere | forbiddingly stern; severely simple and unornamented |
| authentic | genuine |
| authoritative | having the weight of authority; overbearing and dictatorial |
| autonomous | self-governing |
| autopsy | examination of a dead body; postmortem |
| avarice | greediness for wealth |
| averse | reluctant |
| aversion | firm dislike |
| avert | prevent; turn aside |