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crucial

adjectivecommon in dialogue

  • //ˈkɹuː.ʃəl//

Essential or decisive for determining the outcome or future of something; extremely important; vital.

adjective

  1. 1

    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.

    The perfume industry is facing a major problem: maintaining constant levels of quality is crucial, but it is increasingly difficult to obtain a regular supply of all the necessary natural ingredients.

    Vocabulary provides a foundation from which grammar, phonology, and morphology emerge, and in a subject area it provides access to conceptual knowledge. Vocabulary selection for pedagogical purposes is therefore crucial.

  2. 2

    archaicCruciform or cruciate; cross-shaped.

  3. 3

    slangVery good; excellent; particularly applied to reggae music.

    Delbert Wilkins is the most crucial pirate radio DJ in Brixton.

Etymology

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.

Forms

comparative
more crucial
superlative
most crucial
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).