Definition of "crucial"

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.

2014 March 7, Nicole Vulser, “Perfume manufacturers must cope with the scarcity of precious supplies”, in The Guardian Weekly, volume 190, number 13, page 30

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.

2018, Clarence Green, James Lambert, “Advancing disciplinary literacy through English for academic purposes: Discipline-specific wordlists, collocations and word families for eight secondary subjects”, in Journal of English for Academic Purposes, volume 35, page 106

Language is crucial because it is the best weapon against violence. When children don’t have the words to express their thoughts, they raise their fists.

2021 October 1, A Falun Dafa practitioner in France, “Using Truthfulness-Compassion-Forbearance to Guide My Young Students”, in Minghui‎