pivotal (adj.)

• acute
• axial
• capital
• cardinal
• causal
• causative
• central
• centralized
• centric
• centroidal
• centrosymmetric
• charged
• clamorous
• compelling
• concentrated
• constitutive
• critical
• crucial
• crying
• decisive
• determinative
• effectual
• emergent
• essential
• etiological
• exigent
• focal
• formative
• geocentric
• high-pressure
• imperative
• imperious
• important
• insistent
• instant
• key
• loaded
• middle
• middlemost
• midmost
• momentous
• occasional
• originative
• overriding
• pregnant
• pressing
• principal
• radical
• ruling
• significant
• umbilical
• urgent
• vital