This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Extremely significant or important: a crucial problem.

adj. Vital to the resolution of a crisis; decisive: a crucial election. See Synonyms at decisive.

adj. Archaic Having the form of a cross; cross-shaped.

adj. Being essential or decisive for determining the outcome or future of something; extremely important.

adj. Cruciform or cruciate; cross-shaped.

adj. Term of approval, particularly when applied to reggae music.

adj. Having the form of a cross; appertaining to a cross; cruciform; intersecting.

adj. Severe; trying or searching, as if bringing to the cross; decisive.

Having the form of a cross; transverse; intersecting; decussating: as, a crucial incision.

In anatomy, specifically applied to two stout decussating ligaments in the interior of the knee-joint, connecting the spine of the tibia with the intercondyloid fossa of the femur.

Decisive, as between two hypotheses; finally disproving one of two alternative suppositions.

Of or pertaining to a crucible; like a heated crucible as a utensil of chemical analysis.

Pertaining to or like a cross as an instrument of torture for eliciting the truth; excessively strict and severe: said of a proceeding of inquiry.

adj. of the greatest importance

adj. of extreme importance; vital to the resolution of a crisis

adj. having crucial relevance

"Averroes has, unlike Avicenna, made the way something is picked out by the term crucial in determining what kind of modal proposition is produced."

important    of import    polar    life-or-death    critical    decisive    pivotal    life-and-death    material   

crucial ligaments   

crucial experiment   

cruciform    intersecting    severe    decisive   

vital    relevant    decisive    momentous    strategic    specific    fundamental