vade mecum
Derived from Latin meaning 'go with me,' a 'vade mecum' is often a portable reference book or a handy object regularly used.
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Definition
C1General
(formal)A small book or manual that is frequently consulted and carried around for reference.
Example
- She always keeps her vade mecum in her bag for quick reference during meetings.
C1General
(formal)An object that is kept close at hand and used regularly.
Example
- His pocket knife is his vade mecum, always ready for any small task.