[kroo-shuh l] /ˈkru ʃəl/

involving an extremely important decision or result; decisive; critical:
a crucial experiment.
severe; trying.
of the form of a cross; cross-shaped.
involving a final or supremely important decision or event; decisive; critical
(informal) very important
(slang) very good

1706, “cross-shaped,” from French crucial, a medical term for ligaments of the knee (which cross each other), from Latin crux (genitive crucis) “cross” (see cross (n.)). The meaning “decisive, critical” (1830) is extended from a logical term, Instantias Crucis, adopted by Francis Bacon (1620); the notion is of cross fingerboard signposts at forking roads, thus a requirement to choose.


Excellent: crucial new music video (1987+)


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