- 1 extremely large in area, size, amount, etc. synonym huge
- 2 a vast area of forest a vast crowd a vast amount of information At dusk bats appear in vast numbers. His business empire was vast. In the vast majority of cases, this should not be a problem. Your help made a vast difference. Renting the hall was a vast expense.
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NAmE//væstnəs//noun [uncountable, countable] the vastness of space