Lewis Short
sēm-uncĭa (noun F) : semi; semuncia quod dimidia pars unciae,Varr. L. L. 5, § 171 Müll.
* A half-ounce, i. e. the twenty-fourthpart of an as.
* In gen., a twenty-fourth part of any whole: facit heredem ex deunce et semunciā Caecinam,Cic. Caecin. 6, 17: semunciae horarum,Plin. 2, 14, 11, § 58. —Hence, transf., a trifle: bona ejus propter alieni aeris magnitudinem semunciā venierunt, for a trifling sum, qs. for a mere song, Ascon. ad Cic. Mil. fin. p. 54 Orell.— Trop.: brevis semuncia recti,Pers. 5, 121.
* In partic., of weight, the twentyfourth of a pound: semuncia auri,Liv. 34, 1; Cic. Verr. 2, 4, 25, § 57: mellis,Col. 12, 57, 5; 12, 21, 2.—As a measure of dimension, the twenty-fourth of a jugeruin, Col. 5, 1, 10; 5, 2, 4.
* A domestic utensil of unknown capacity, Cato, R. R. 10, 3.
Charlton T. Lewis, Charles Short, A Latin Dictionary