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