Very good; excellent; particularly applied to reggaemusic.
1706, from French crucial, a medical term for ligaments of the knee (which cross each other), from Latin crux (English crux), from the Proto-Indo-European *(s)ker- ("to turn, to bend").
The meaning “decisive, critical” is extended from a logical term, Instantias Crucis, adopted by Francis Bacon in his influential Novum Organum (1620); the notion is of cross fingerboard signposts at forking roads, thus a requirement to choose.
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