To convert or turn something into something else (an archaic or specialized variant of convert).
Latin convertere + -ise (British variant of -ize). An obsolete or rare variant spelling that appeared in Middle English and Early Modern English before standardization on 'convert'.
English spelling wasn't standardized until the printing press spread widely in the 1500s-1600s. Words like 'convertise' show us how writers in different regions spelled the same concept differently—there was no 'wrong' way until dictionaries decided there was!
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