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pivotal (adj) of great importance.
A pivotal event is an event of great importance. A pivotal decision is an important decision on which a number of other things depend. ‘Heavy industries and export potential are pivotal to the development of a country.’ This means that heavy industries and the ability to export are important for the prosperity of a country. A cease fire is pivotal to the peace in West Asia, as then only can there be a negotiated settlement.
- His innings was pivotal to the victory of the team. His timely century and his getting two valuable wickets saw the team through to a comfortable victory.
- Einstein’s discovery has proved pivotal to the development of space travel, for without it, space travel would have remained a dream.