To change is to make a material or radical difference or to substitute one thing for another of the same kind: to change a lock; to change one's plans. To alter is to make some partial change, as in appearance, but usu. to preserve the identity: to alter a garment; to alter a contract.
change (third-person singular simple present changes, present participle changing, simple past and past participle changed) (intransitive) To become something different.
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