| A | B |
| abdicate | (verb) to renounce or relinquish a throne, right, or power |
| abstemious | (adj) sparing or moderate in eating and drinking; temperate in diet |
| affidavit | (noun) a written declaration upon oath made before an authorized official |
| alchemy | (noun) a form of chemistry and speculative philosophy practiced in the Middle Ages and the Renaissance |
| aphorism | (noun) a terse saying embodying a general truth, or astute observation, as "Power tends to corrupt, and absolute power corrupts absolutely" (Lord Acton) |
| apocryphal | (adj) of doubtful auhorship or authenticity |
| appurtenance | (noun) something subordinate to another, more important thing |
| arcane | (adj) known or understood by very few; mysterious |
| arduous | (adj)requiring great exertion; laborious; difficult |
| arsenal | (noun) a place of storage or a magazine containing arms and military equipment for land or naval service |