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Either spelling is correct. The spelling "advertise" is the British spelling whereas the spelling "advertize" is the American spelling of the word. The same is true for words like organise/organize, recognise/recognize, or realise/realize. The former in these cases is British, the latter American. Some confusion may occur as often a spell check system will accept only one of these and is not always consistent as to which it preferences.

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12y ago

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