Definitions for "Twelfth"
Next in order after the eleventh; coming after eleven others; -- the ordinal of twelve.
Constituting, or being one of, twelve equal parts into which anything is divided.
The quotient of a unit divided by twelve; one of twelve equal parts of one whole.
Even if you omit the [f] in your pronunciation of this word (which you shouldn"t do), it is retained in the spelling.
position 12 in a countable series of things
An interval comprising an octave and a fifth.