alter Definition in the Cambridge English Dictionary
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Definition of “alter” - English Dictionary

Definition of "alter" - American English Dictionary

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alterverb [I/T]

 us   /ˈɔl·tər/
to ​change a ​characteristic, often ​slightly, or to ​cause this to ​happen: [T] The ​coat was too ​long, so I took it back to the ​store to have it altered.
alterable
adjective  /ˈɔl·tər·ə·bəl/
Some things in ​life are not alterable.
alteration
noun [C/U]  us   /ˌɔl·təˈreɪ·ʃən/
[C] I had to make some alterations in my ​researchpaper.
(Definition of alter from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "alter" - British English Dictionary

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alterverb

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 ​ourplans. Although the ​cost of making ​phonecalls is going up, the ​charge for ​connecting to the internet will not alter. Giving up ​ourcar has ​radically altered ​ourlifestyle. [T] to ​change the ​size of ​clothes so that they ​fitbetter: I took the ​coat back to the ​shop to have it altered.
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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)

Definition of "alter" - Business English Dictionary

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alterverb [I or T]

uk   us   /ˈɔːltər/
to ​change the appearance, ​character, or ​structure of something, or to be ​changed in this way: Just last week, the ​companyagreed to alter some of its ​businesspractices. If they want to continue to have enough ​workers to ​fill their ​contracts, the ​company will have to alter the way it does ​business. Discovering new ​oildeposits could ​substantially alter the ​balance between ​supply and ​demand. It was back in 2002 that the ​shape of the ​business began to alter.
(Definition of alter from the Cambridge Business English Dictionary © Cambridge University Press)
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