from The American Heritage® Dictionary of the English Language, 4th Edition
- 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- 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.
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- 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.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. of the greatest importance
- adj. of extreme importance; vital to the resolution of a crisis
- adj. having crucial relevance
From New Latin (īnstantia) crucis, (experīmentum) crucis, crossroads (case), crossroads (experiment), from Latin crux, cruc-, cross. Sense 2, French, from Old French, from Latin crux.(American Heritage® Dictionary of the English Language, Fourth Edition)
1706, from French crucial, a medical term for ligaments of the knee (which cross each other), from Latin crux, crucis ("cross") (English crux), from the Proto-Indo-European *(s)ker- (“to turn, to bend”). (Wiktionary)