uncapitalize in English dictionary uncapitalize Meanings and definitions of "uncapitalize" verb (transitive) To convert the first letter (or more) of (something) from uppercase to lowercase; to make uncapitalized. more Grammar and declension of uncapitalize uncapitalize (third-person singular simple present uncapitalizes, present participle uncapitalizing, simple past and past participle uncapitalized) more Sample sentences with "uncapitalize" Declension Stem Try again Authors