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| Alacrity | eagerness; enthusiasm; quickness |
| Alchemy | medieval chemistry; attempt to change base metal into gold |
| Alibi | an excuse that shows someone was not at a crime scene |
| Allay | to lessen |
| Alleviate | make less severe |
| Aloof | distant; detached; cold |
| Altruism | putting others first; being self-sacrificing |
| Amass | accumulate |
| Ambiguity | uncertainty; vagueness |
| Ambiguous | unclear in meaning; can be interpreted in different ways |
| Ambivalence | lack of clarity; wavering; being undecided |
| Ambulatory | able to walk around (used of hospital patients) |
| Ameliorate | make better |
| Amelioration | improvement |
| Amiable | friendly |
| Amity | friendship |
| Amorphous | lacking in shape |
| Analgesic | medicine to combat pain |
| Analogous | comparable |
| Anarchy | chaos; lack of government |