| A | B |
| astute | keen of mind and judgement; |
| asylum | an institutution that shelters and cares for mentally unbalanced, aged or homeless people |
| asylum | any place offering protection or security |
| asylum | protection against a legal or social penalty |
| atone | to make up for or repent |
| atrocity | a savagely cruel, brutal, or inhuman deed |
| atrophy | a failure to develop normally; a progressive wasting away |
| attrition | a gradual wearing down or weakening of resistance resulting from constant friction, pressure or harrassment |
| attrition | a gradual, often natural decrease in size, strength, or number as a result of resignation, death or the like |
| augment | to make greater |
| augur | someone who can forecast the future |
| augur | to predict or foretell by signs |
| austere | rigidly severe; severely simple or bare |
| authentic | genuine; trustworthy |