/ ˌeɪd memˈwɑː(r); NAmE / noun
(from French ) ( pl. aides-memoire , aides-memoires ) / ˌeɪd memˈwɑː(r); NAmE / a thing, especially a book or document, that helps you to remember sth
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WORD ORIGIN
mid 19th cent.: from French aide-mémoire , from aider to help and mémoire memory.