a. - Of, pertaining to, or designating, a certain style of letters used in ancient manuscripts, esp. in Greek and Latin manuscripts. The letters are somewhat rounded, and the upstrokes and downstrokes usually have a slight inclination. These letters were used as early as the 1st century b. c., and were seldom used after the 10th century a. d., being superseded by the cursive style.
n. - An uncial letter.