a. [ L. uncialis amounting to the twelfth part of a pound or a foot, from uncia the twelfth part of a pound or of a foot, an ounce, an inch: cf. F. oncial. See Inch a measure. ] 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 These letters were used as early as the 1st century b. c., and were seldom used after the 10th century a. d., being superseded by the cursive style. [ 1913 Webster ]

n. An uncial letter. [ 1913 Webster ]