To make contemporary or modern; to adapt something to current times or standards (British spelling).
From 'contemporary' plus the verb-forming suffix '-ise' (British) or '-ize' (American). This is the less common British variant of 'contemporize.'
British English preserves '-ise' endings in many words where American English switched to '-ize,' and this word is a perfect example—the same verb, just spelled differently across the Atlantic!
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