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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

alter (v.)
make an alteration to;
This dress needs to be altered
alter (v.)
insert words into texts, often falsifying it thereby;
Synonyms: interpolate / falsify
alter (v.)
remove the ovaries of;
Synonyms: neuter / spay / castrate
alter (v.)
cause to change; make different; cause a transformation;
The advent of the automobile may have altered the growth pattern of the city
Synonyms: change / modify
alter (v.)
become different in some particular way, without permanently losing one's or its former characteristics or essence;
Synonyms: change / vary
From wordnet.princeton.edu