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an-1
a prefix occurring before stems beginning with a vowel or h in loanwords from Greek, where it means "not," "without," "lacking" (anarchy; anecdote); used in the formation of compound words: anelectric. Also, before a consonant, a-.[ < Gk. See A-6, IN-3, UN-1]an-2 an-3
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Universalium. 2010.