British spelling of practice (verb); to perform an activity repeatedly to improve skill or to engage in a profession regularly. It involves deliberate repetition for improvement.
From Old French 'practiser', from Medieval Latin 'practicare', from Greek 'praktikos' (fit for action). British English maintains the 's' for the verb form, while American English uses 'c' for both noun and verb.
Practise versus practice is one of the clearest examples of British-American spelling differences serving grammatical purposes—British English uses 's' for verbs and 'c' for nouns, creating a helpful distinction that American English abandons!
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