crucial.
Essential or decisive for determining the outcome or future of something; extremely important; vital.
Meaning & usage
Essential or decisive for determining the outcome or future of something; extremely important; vital.
The battle of Tali-Ihantala in 1944 is one of the crucial moments in the history of Finland.
A secure supply of crude oil is crucial for any modern nation, let alone a superpower.
Cruciform or cruciate; cross-shaped.
Very good; excellent; particularly applied to reggae music.
Delbert Wilkins is the most crucial pirate radio DJ in Brixton.
Where this word comes from
1706, from French crucial, a medical term for ligaments of the knee (which cross each other), from Latin crux, crucis (“cross”) (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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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.