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Definition of pivotal : Of or pertaining to a pivot or turning point; belonging to, or constituting, a pivot; of the nature of a pivot; as, the pivotalopportunity of a career; the pivotal position in a battle.

Synonyms:

frigid, icy, arctic, key, glacial, diametrical, diametric, polar, gelid, opposite

executive, causal, germinal, formative, generative, motivational, causative, effective, responsible

grave, world-shaking, momentous, high-powered, prominent, crucial, big-name, important, distinguished, big-wig, influential, considerable, earthshaking, consequential, noteworthy, salient, serious, critical, notable, heavyweight, eminent

half, mezzo, median, halfway, average, mediocre, mean, half-and-half, core, centralized, middling, middle, medium, nuclear, bisecting, equidistant, intermediate, geocentric, mid, midmost, middle-of-the-road, central, axial, medial

innermost, main, midway, interior, focal

Usage examples:

• " No; it's that pivotal girl," said March; and his wife said, " Well, I'm glad he won't be put down by them." - "Their Silver Wedding Journey", William Dean Howells.
• The pivotal point of the town’ s rendezvous and gossip on Sunday afternoon was the Three Star Grocery. - "The Heart of Canyon Pass", Thomas K. Holmes.
• Pemaquid, then, becomes one of the pivotal points of New England discovery, as it subsequently was of her history. - "Nooks and Corners of the New England Coast", Samuel Adams Drake.