Definition
Pivotal describes the point everything turns on. A pivot is the fixed pin at the heart of a hinge or a pair of scales, and what is pivotal occupies that position in events: the pivotal meeting, the pivotal year, the pivotal witness. The word makes a claim about structure, not size — a pivotal moment may be small and quiet, but the outcome rotates around it, and had it gone otherwise, everything after would sit differently.
Examples
- The 1969 conference proved pivotal in the development of the modern internet.
- She played a pivotal role in the negotiations, though her name rarely appeared in the press.
- Deciding to repeat the failed experiment turned out to be the pivotal moment of his career.
Synonyms
crucial · critical · decisive · central · key
In TOEFL & IELTS
'Play a pivotal role in' is one of the highest-value collocations in exam English — it lifts essays, integrated writing, and Speaking Part 2 stories alike. In TOEFL history passages, 'pivotal moment/event/figure' flags exactly what the questions will ask about, so treat it as a signpost while reading. Keep it stronger than 'important': reserve pivotal for the point where the outcome genuinely turned.