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Words ending in -ize/-ise

Verbs in British English that can be spelled with either -ize or -ise at the end are always spelled with -ize at the end in American English:

US British
apologize apologize or apologise
organize organize or organise
recognize recognize or recognise

The same is true of words that end in -ization or -isation in British English. In American English, they always end in -ization:

US British
civilization civilization or civilisation
modernization modernization or modernisation

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Grammar and usage