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pivotal

/ˈpɪvɪtəl/ adjective

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about pivotal at Wordnik → Where our words come from →

  1. Being of crucial importance.
    a pivotal event

Origin

From pivot + -al.

From Wiktionary, via Kaikki.org (CC BY-SA)