The party of men became three: (Th, S, M, L, K:) and similar to this are the other verbs of number, to ten [inclusive]: (S:) also The party of men became thirty: and so in the cases of other numbers, to a hundred [exclusive]. (M, L.)
2.
اثلثتShe (a camel, and any female,) brought forth her third young one, or offspring; (Th, M;) and so ↓ثلّثت, or ↓اثتلثت. (TA in article بكر.)
3.
لَا يُثْنِى وَلَا يُثْلِثُ: see 1.
4.
اثلث said of a grape-vine, It had one third of its fruit remaining, two thirds thereof having been eaten. (M.)