crucial

American  

[kroo-shuhl] / ˈkru ʃəl /

adjective

1. involving an extremely important decision or result; decisive; critical.

   a crucial experiment.

   Synonyms:

   significant, essential, vital, momentous

2. severe; trying.

3. of the form of a cross; cross-shaped.

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crucial British  

/ ˈkruːʃəl /

adjective

1. involving a final or supremely important decision or event; decisive; critical

2. informal very important

3. slang very good

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Usage

What does crucial mean? Crucial means extremely important or involving an extremely important decision or course of action. Close synonyms are critical and decisive. The word crucial is usually used to describe pivotal moments, choices, or actions that will affect everything that follows, as in We’re at a crucial point in the process—we need to make some big decisions. Sometimes, crucial is simply used to describe something that’s extremely important, as in Getting enough sleep is crucial for staying healthy.  Example: I can’t express how absolutely crucial it is to surround yourself with the right friends.

Other Word Forms

• cruciality noun
• crucially adverb
• noncrucial adjective
• noncrucially adverb
• precrucial adjective

Etymology

Origin of crucial

First recorded in 1700–10; from Latin cruci- (stem of crux cross ( def. ) ) + -al ¹ ( def. )

Explanation

The word crucial describes something that is important or essential to success, like the crucial dress rehearsals that ensure everything will run smoothly on your play's opening night. Usage experts insist that the word crucial should be used only to describe something that is truly critical for solving a problem or for resolving a situation, such as a crucial vote that determines a final outcome. In this case the crucial vote is decisive: it determines the outcome. But the word has gained popularity as a way to say that something is important. You might hear someone say, for example, that it is crucial to allow employees to vote on the new schedule to make them feel like they’re part of the process. In this case the sense is “important”: nothing decisive is taking place.

Example Sentences

With Van Gerwen - currently in the fourth and final play-off spot - picking up points, it was crucial for Humphries to do so too.

From BBC • Apr. 23, 2026

Investor bullish sentiment rose to 46% this week, but coming earnings and Federal Reserve meeting will be crucial for market direction.

From Barron's • Apr. 23, 2026

India imports more than half of its cooking gas, the bulk of which is shipped through the crucial strait.

From The Wall Street Journal • Apr. 22, 2026

With bitcoin now moving higher and pulling away from that crucial level, sentiment among investors toward Strategy has improved accordingly.

From MarketWatch • Apr. 22, 2026

Frank was trained as a waiter and later became Mount Vernon’s head butler, a crucial and prestigious job in a household like Washington’s.

From "In the Shadow of Liberty" by Kenneth C. Davis

Related Words

• central
• compelling
• deciding
• decisive
• essential
• imperative
• momentous
• necessary
• pivotal
• pressing
• touchy
• urgent
• vital