Definition of memento

< Memel

memento mori >

me·men·to    (m-mnt) KEY 

NOUN:
pl. me·men·tos or me·men·toes

A reminder of the past; a keepsake.

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ETYMOLOGY:
Middle English, commemoration of the living or the dead in the Canon of the Mass, from Latin mement, imperative of meminisse, to remember; see men-¹ in Indo-European roots