\Twelfth\, a. [For twelft, OE. twelfte, AS. twelfta. See
{Twelve}.]
1. Next in order after the eleventh; coming after eleven
   others; -- the ordinal of twelve.
2. Consisting, or being one of, twelve equal parts into which
   anything is divided.

\Twelfth\, n.
1. The quotient of a unit divided by twelve; one of twelve
   equal parts of one whole.
2. The next in order after the eleventh.
3. (Mus.) An interval comprising an octave and a fifth.