Entry 1 sense Webster, 1913 Souvenir /so͞ovˌ-ən-ĭr'/ · Sou·ve·nir · IPA /ˈsu.vəˌnɪɹ/ 01 n. That which serves as a reminder; a remembrancer; a memento; a keepsake. 1. That which serves as a reminder; a remembrancer; a memento; a keepsake.