ETYM French, from souvenir to remember, from Latin subvenire to come up, come to mind; sub under + venire to come, akin to Eng. come. See Come, Subvention.
That which serves as a reminder; a remembrancer; a memento; a keepsake.
2. Impression. Un souvenir pénible.
3. Objet qui rappelle quelque chose. Un souvenir de Paris.