Thirty

1. a. Being three times ten; consisting of one more than twenty-nine; twenty and ten; as, the month of June consists of thirty days.
2. n. The sum of three tens, or twenty and ten; thirty units or objects.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.