Adjective : a crucial experiment.    From Dictionary.com. 

A couple years ago, I suggested that stressing this and the consequent cruciality of quotes in the HTML help above the comments form would be a simple prevention; I still think so.    From Wordnik.com.  [Making Light: Amazon & Macmillan] Reference

Now El Gordo and his feeble Home Secretary, Jacqui Smith, return to the refrain of essentiality and cruciality, squawking about how 42 days is utterly vital to the War On…yawwwn… etc.    From Wordnik.com.  [42 Days (1008 Hours or 60,480 Minutes) Detention Without Charge « INTERSTELLAR TACTICS] Reference

A combination of equipment cruciality and effects of work can be cross - referenced into a matrix to provide a relative weight of each task in comparison with all other types of tasks.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Equipment cruciality • Effects of a task or work accomplished • Limitations Equipment cruciality and effects of a task are first determined and there are nine levels of importance.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Benedict allen and the ice dogs of siberia more recently there’s the intriguing tale of the continuing tradition of canine cruciality with explorer benedict allen, the ranulph fiennes of the anthropology/exploration world. allen has crossed the amazon basin, lived with isolated peoples in papua new guinea and walked the gobi desert with a group of reluctant camels.    From Wordnik.com.  [canis canem] Reference