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pivotal

[piv-uh-tl] /ˈpɪv ə tl/
adjective
1.
of, relating to, or serving as a pivot.
2.
of vital or critical importance:
a pivotal event.
Origin of pivotal
1835-1845
1835-45; pivot + -al1
Related forms
pivotally, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for pivotal

pivotal

/ˈpɪvətəl/
adjective
1.
of, involving, or acting as a pivot
2.
of crucial importance
Derived Forms
pivotally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for pivotal
adj.

1844, in figurative sense, from pivot (n.) + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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