<p><strong>Noun</strong></p><ul><li>An act or instance of tapping telephone or telegraph wires for evidence or other information.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) Wire·tapped, wire·tap·ping: to obtain (information, evidence, etc.) by tapping telephone or telegraph wires: to wiretap conversations.</li><li>To listen in on by means of a wiretap: to wiretap a telephone; to wiretap a conversation.</li><li>(used without object) Wire·tapped, wire·tap·ping: to tap telephone or telegraph wires for evidence, information, etc.</li></ul><p><strong>Adjective</strong></p><ul><li>Pertaining to or obtained by wiretap.</li></ul>