Adjective (en adjective) Being essential or decisive for determining the outcome or future of something; extremely important. *{{quote-magazine, date=2014-03-07, author= Nicole Vulser, volume=190, issue=13, page=30, magazine=(The Guardian Weekly) , title= Perfume manufacturers must cope with the scarcity of precious supplies, passage=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 ...
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