The meaning of CRUCIAL is important, significant. How to use crucial in a sentence. Synonym Discussion of Crucial.

CRUCIAL definition: involving an extremely important decision or result; decisive; critical. See examples of crucial used in a sentence.

CRUCIAL definition: 1. extremely important or necessary: 2. extremely important or necessary: 3. (of a decision or…. Learn more.

Definition of crucial adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Define crucial. crucial synonyms, crucial pronunciation, crucial translation, English dictionary definition of crucial. adj. 1. a. Extremely significant or important: "Infancy ... is now understood as a …

WordReference Random House Learner's Dictionary of American English © 2025 cru•cial /ˈkruʃəl/ adj. of highest, greatest, or most critical importance: a crucial experiment. cru•cial•ly, adv.: The weather …

Being essential or decisive for determining the outcome or future of something; extremely important. The battle of Tali-Ihantala in 1944 is one of the crucial moments in the history of Finland. …

If you describe something as crucial, you mean it is extremely important. He had administrators under him but took the crucial decisions himself. ...the most crucial election campaign for years.

Mar 6, 2026 · crucial (comparative more crucial, superlative most crucial) Essential or decisive for determining the outcome or future of something; extremely important; vital.

Crucial is an adjective which means extremely important, decisive or critical, especially in the success or failure of something. Etymology: [F. crucial, fr. L. crux, crucis, cross, torture. See Cross.] …