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altruistic
unselfish
ambivalence
having conflicting attitudes
ameliorate
make better/improve
anathema
strong denunciation
anecdote
account of some happenings (short, entertaining)
antidote
that which counteracts
antipathy
dislike; aversion
apocryphal
doubtful authenticity; fictitious
apostasy
renunciation of faith
approbation
approval
arbitrary
based on whim rather than reason
archaic
language now rarely used
ascertain
find out with certainty
astute
shrew in judgement; keen mind
atonement
reconciliation with God
atrophy
waste away; fail to grow
austere
stern in manner/appearance; strict morals
autonomy
self-rule
avarice
greed
banal
hackneyed; overused