Capitalize

wiktionary

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capital +‎  -ize. From Latin capitalis(“of or pertaining to the head”). 

etymonline

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capitalize (v.)

"write or print in capital letters," 1764, from capital (n.1) + -ize. Meaning "to convert (assets) to capital" is recorded from 1868, from capital (n.2). Related: Capitalized; capitalizing.