Entry 1 sense Webster, 1913 Maestro /(mīs"trō̇; It. mä*ā̇s"trō̇)/ · Ma·es·tro · IPA /ˈmaɪstɹoʊ/ 01 n. A master in any art, especially in music; a composer or orchestra conductor. 1. A master in any art, especially in music; a composer or orchestra conductor.