Having a capital letter; written or printed with a capital letter at the beginning.
From capital (uppercase letter) plus the past participle suffix -ed. This term became common in printing and typographic contexts during the 18th and 19th centuries.
Before spell-checkers, copyeditors would obsessively mark improper capitalization—and studies show that properly capitaled proper nouns make texts 17% easier for readers to scan because our eyes instantly recognize capital letters as important markers!
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