/ məˈmentəʊ; NAmE -toʊ/ noun
( pl. -oes or -os ) a thing that you keep or give to sb to remind you or them of a person or place
SYN souvenir :
a memento of our trip to Italy
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WORD ORIGIN
late Middle English (denoting a prayer of commemoration): from Latin , literally remember! , imperative of meminisse .