Entry 4 senses · 3 variants Webster, 1913 Eight /(āt)/ · IPA /eɪt/ n. a. n. 01 n. An island in a river; an ait. 1. An island in a river; an ait.[Obs.] 02 a. Seven and one; as, eight years. 1. Seven and one; as, eight years. 03 n. The number greater by a unit than seven; eight units or objects. 1. The number greater by a unit than seven; eight units or objects. 2. A symbol representing eight units, as 8 or viii.