Ŭn'ci-a, n.

(ŭn'shĭ-ă), n.; pl. ŬN'SHĬ-Æ. [Lat.]

1. (Rom. Antiq.) A twelfth part, as of the Roman as.
2. (Alg.) A numerical co-efficient in any particular case of the binomial theorem. [Obs.]

That admirable invention of Mr. Newton, whereby he determines the uncia. Hall.