- tenth [tenth]adj.[Early ME tenthe, replacing OE teogotha, teotha: see TEN & -TH2]1. preceded by nine others in a series; 10th2. designating any of the ten equal parts of somethingn.1. the one following the ninth2. any of the ten equal parts of something; 1/ 103. a tenth of a gallonadv.in the tenth place, rank, group, etc.tenthlyadv.
English World dictionary. V. Neufeldt. 2014.