Толковый словарь английского языка Oxford English Reference - twelve

n. & adj. --n. 1 one more than eleven; the product of two units and six units. 2 a symbol for this (12, xii, XII). 3 a size etc. denoted by twelve. 4 the time denoted by twelve o'clock (is it twelve yet?). 5 (the Twelve) the twelve apostles. 6 (12) Brit. (of films) classified as suitable for persons of 12 years and over. --adj. that amount to twelve. Phrases and idioms twelve-note (or -tone) Mus. using the twelve chromatic notes of the octave on an equal basis without dependence on a key system. Etymology: OE twelf(e) f. Gmc, prob. rel. to TWO