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Adjective crucial has 4 senses
crucial, important - of extreme importance; vital to the resolution of a crisis; "a crucial moment in his career"; "a crucial election"; "a crucial issue for women"Antonym:  noncrucial
 
crucial, relevant - having crucial relevance; "crucial to the case"; "relevant testimony"Antonym:  immaterial (indirect, via material)
 
all-important, all important, crucial, essential, of the essence - of the greatest importance; "the all-important subject of disarmament"; "crucial information"; "in chess cool nerves are of the essence"Antonym:  unimportant (indirect, via important)
 
crucial, deciding, determinant, determinative, determining - having the power or quality of deciding; "the crucial experiment"; "cast the deciding vote"; "the determinative (or determinant) battle"Antonym:  indecisive (indirect, via decisive)
 
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