In a manner relating to or with respect to the center; in a central way or direction.
From 'center' plus the suffix '-wise' (meaning 'in the manner of' or 'with respect to'). This Old English-style formation is now archaic in English.
'-Wise' endings were productivity machines in older English—you could add '-wise' to almost anything to create a new adverb, but modern English prefers 'in terms of' instead.
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