Entry 4 senses · 3 variants Webster, 1913 Isle /īl/ · IPA /aɪ̯l/ n. n. v. t. 01 n. See Aisle. 1. See Aisle.[Obs.] See: Aisle 02 n. An island. 1. An island.[Poetic] “Imperial rule of all the seagirt isles.” — Milton. 2. A spot within another of a different color, as upon the wings of some insects.(Zool.) 03 v. t. To cause to become an island, or like an island; to surround or encompass; to island. 1. To cause to become an island, or like an island; to surround or encompass; to island.[Poetic] “Isled in sudden seas of light.” — Tennyson.