Definition of vade mecum noun from the Oxford Advanced Learner's Dictionary

 

vade mecum

 noun
noun
BrE BrE//ˌvɑːdi ˈmeɪkəm//
 
; NAmE NAmE//ˌvɑːdi ˈmeɪkəm//
 
(from Latin, formal)
 
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a book or written guide which you keep with you all the time, because you find it helpful Word Origin early 17th cent.: modern Latin, literally ‘go with me’.
See the Oxford Advanced American Dictionary entry: vade mecum