Definify.com
Webster 1913 Edition
Twelfth
1.
Next in order after the eleventh; coming after eleven others; – the ordinal of twelve.
2.
Constituting, or being one of, twelve equal parts into which anything is divided.
Twelfth
,Noun.
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.
Webster 1828 Edition
Twelfth
TWELFTH
,Adj.