Twelfth

1. n. An interval comprising an octave and a fifth.
2. a. Next in order after the eleventh; coming after eleven others; — the ordinal of twelve.
3. a. Consisting, or being one of, twelve equal parts into which anything is divided.
4. n. The quotient of a unit divided by twelve; one of twelve equal parts of one whole.
5. n. The next in order after the eleventh.

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.