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pivotal

piv·o·tal

pivotal

 
pronunciation:
pI v tl
part of speech: adjective
definition 1: of, pertaining to, or acting as a pivot.
similar words:
axial, central, focal
definition 2: critically important or crucial; on which something is contingent.
The role that he played in the negotiations was pivotal; without his involvement, little would have been achieved.
synonyms:
central, critical, crucial, important
similar words:
consequential, decisive, fatal, grave, momentous, significant, vital
derivation: pivotally (adv.)