Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: vastus 'empty, desolate, very large'

vast

adjective
     
vast S2 W2
1 extremely large [= huge]
vast amounts/numbers/quantities/sums etc (of something)
The government will have to borrow vast amounts of money.
The refugees come across the border in vast numbers.
In the past five years, there has been a vast improvement in graduation rates.
2

the vast majority (of something)

used when you want to emphasize that something is true about almost all of a group of people or things:
The vast majority of books on the subject are complete rubbish.
vastness noun [uncountable]

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