twelfth /twɛlfθ/noun 2adjective 1forms 1 noun2 •One of twelve equal parts of a whole.A twelfth of 240 is 20.Five twelfths of the population voted in support of the proposal. •An interval equal to an octave plus a fifth. adjective1 •The ordinal form of the number twelve, describing a person or thing in position number 12 of a sequence.The answer appears on the twelfth page of the book.She finished twelfth in the race. formstwelfths
