Uncia

·noun A twelfth part, as of the Roman as; an Ounce.

II. Uncia ·noun A numerical coefficient in any particular case of the binomial theorem.

uncia
uncĭa, ae, f., = οὐγκία (Siculian and Etruscan; v. Müller, Etrusk. 1, p. 309 sq.) [akin to unus, uni...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
uncia
uncia ae, f cf. ūnus, ūnicus, the twelfth part, a twelfth : Caesar ex unicā, sed Lepta ex triente,...

An Elementary Latin Dictionary