Eight Eight, n. 1. The number greater by a unit than seven; eight units or objects. 2. A symbol representing eight units, as 8 or viii., Eight Eight, n. [See Ait.] An island in a river; an ait. [Obs.] ``Osiers on their eights.' --Evelyn., Eight Eight, a. [AS. eahta; akin to OS. ahto, OFries. achta, D. & G. acht, OHG. ahto, Icel. [=a]tta, Sw. [*a]tta, Dan. otte, Goth. ahtau, Lith. aszt?ni, Ir. & Gael. ochd, W. wyth, Armor. eich, eiz, L. octo, Gr. ?, Skr. ash?an. ????. Cf. Octave.] Seven and one; as, eight years.