Uncia \Un"ci*a\, n.; pl. Unci[ae]. [L. See Ounce a measure of weight.]

1. (Rom. Antiq.) A twelfth part, as of the Roman as; an ounce.

2. (Alg.) A numerical coefficient in any particular case of the binomial theorem. [Obs.]

Source: Webster's Revised Unabridged Dictionary (1913)