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alter (v.)
late 14c., "to change (something), make different in some way," from Old French alterer "to change, alter," from Medieval Latin alterare "to change," from Latin alter "the other (of the two)," from PIE root *al- (1) "beyond" + comparative suffix -ter (as in other). Intransitive sense "to become otherwise" first recorded 1580s. Related: Altered; altering.
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Definitions of alter from WordNet
Dictionary entries near alter
also-ran
alt
Altaic
Altair
altar
alter
alter ego
alterable
alteration
altercate
altercation