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English definition of “alter”

alter

verb uk   /ˈɒl.tər/ us    /ˈɑːl.t̬ɚ/

alter verb (CHANGE)

B2 [I or T] to change something, usually slightly, or to cause the characteristics of something to change: We've had to alter some of our plans. Although the cost of making phone calls is going up, the charge for connecting to the internet will not alter. Giving up our car has radically altered our lifestyle. [T] to change the size of clothes so that they fit better: I took the coat back to the shop to have it altered.

alter verb (REMOVE ORGANS)

[T] US polite word for castrate or spay
(Definition of alter from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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