Recognise

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late Middle English (earliest attested as a term in Scots law): from Old French reconniss-, stem of reconnaistre, from Latin recognoscere ‘know again, recall to mind’, from re- ‘again’ + cognoscere ‘learn’.

etymonline

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recognise (v.)

chiefly British English spelling of recognize; for spelling, see -ize. Related: Recognised; recognising; recognisance; recognisable.