Толковый словарь английского языка Oxford English Reference - tenth

n. & adj. --n. 1 the position in a sequence corresponding to the number 10 in the sequence 1-10. 2 something occupying this position. 3 one of ten equal parts of a thing. 4 Mus. a an interval or chord spanning an octave and a third in the diatonic scale. b a note separated from another by this interval. --adj. that is the tenth. Phrases and idioms tenth-rate of extremely poor quality. Derivatives tenthly adv. Etymology: ME tenthe, alt. of OE teogotha