| apartheid | A policy or system of segregation or discrimination on grounds of race | |
| apace | Swiftly, quickly, at a fast pace | |
| antipode | A direct or exact opposite | |
| antediluvian | Of or belonging to the time before the biblical Flood | |
| antedate | Precede in time; come before (something) in date | |
| anomaly | Something that deviates from what is standard, normal, or expected | |
| anodyne | Not likely to provoke dissent or offense; inoffensive, often deliberately so | |
| annul | To make legally void or invalid | |
| animosity | Strong hostility or active dislike towards someone or something | |
| anile | resembling or characteristic of an old woman; notably weak or senile | |