Entry 1 sense Webster, 1913 Eyewitness /īw'-ĭt'-nəs/ · Eye·wit·ness · IPA /ˈaɪwˈɪtnəs/ 01 n. One who sees a thing done; one who has ocular view of anything. 1. One who sees a thing done; one who has ocular view of anything. “We . . . were eyewitnesses of his majesty.” — 2 Pet. i. 16.