| A | B |
| Ante (L) | "before" |
| antebellum | of a period before a war |
| antecedent (n.) | a thing or event that precedes |
| antecedent (grammar) | the noun to which a pronoun refers |
| anterior | coming before in position or time |
| avant-garde | ahead of the times, esp. in the arts |
| vanguard (1) | the foremost position, esp. of an army or fleet |
| vanguard (2) | leaders of a movement, fashion, etc. |
| Pre (L) | "before" |
| precept | a command; a rule of conduct |
| predestination | the belief that what happens in human life has already been determined by some higher power |
| preempt, pre-empt | to take possession of something before anyone else can do it |
| premonition | a warning in advance |
| Monere (L) | "to warn" |
| preposterous | absurd; contrary to nature or reason |
| pretentious | showy, pompous, claiming unjustified distinction |