eightn.[See Ait.] An island in a river; an ait.(Evelyn.)a.[AS. eahta; akin to OS. ahto, OFries. achta, D. & G. acht, OHG. ahto, Icel. tta, Sw. tta, Dan. otte, Goth. ahtau, Lith. asztni, Ir. & Gael. ochd, W. wyth, Armor. eich, eiz, L. octo, Gr. 'oktw`, Skr. ashan. 306. Cf. Octave.] Seven and one; as, eight years.()n.1. The number greater by a unit than seven; eight units or objects.()2. A symbol representing eight units, as 8 or viii.()