Толковый словарь английского языка Oxford English Reference - twelfth

n. & adj. --n. 1 the position in a sequence corresponding to the number 12 in the sequence 1-12. 2 something occupying this position. 3 each of twelve equal parts of a thing. 4 Mus. a an interval or chord spanning an octave and a fifth in the diatonic scale. b a note separated from another by this interval. --adj. that is the twelfth. Phrases and idioms Twelfth Day 6 Jan., the twelfth day after Christmas, the festival of the Epiphany. twelfth man a reserve member of a cricket team. Twelfth Night the evening of 5 Jan., the eve of the Epiphany. twelfth part = sense 3 of n. Derivatives twelfthly adv. Etymology: OE twelfta (as TWELVE)