Thirty

a. [O. Eng. thrítti, A-S. thrîtig, thrîttig, O. Sax. thrîtig, O. Fries. thrîtich, Icel. þrjátíu, Sw. trettio, Dan. tredive, D. dertig, L. Ger. dertig, dörtig, O. H. Ger. drizīo, drizug, M. H. Ger. drīze, N. H. Ger. dreiszig, Goth. þrīstigjus.] Three times ten; one more than twenty-nine; twenty and ten; as, the month of June consists of thirty days.

n. 1. The sum of three times ten, or twenty and ten. 2. A symbol representing thirty units, as 30, or xxx.