uncial /ˈʌn.si.əl/noun 3adjective 2forms 3 noun3 •A style of writing using uncial letters. •A letter in this style. •A manuscript in this style. adjective2 •Of or relating to a majuscule style of writing with unjoined, rounded letters, originally used in the 4th–9th centuries. •(rare) Of or relating to an ounce, or an inch, especially to letters printed an inch high. formsuncials · more uncial · most uncial