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a vast empty plain
Our dog eats a vast amount of food each day.
the vast array of computer games available
People flocked to the show in vast numbers.
I believe the vast majority of people (=almost everyone) will support us.
the vast expanse of the National Park
The vastness of the topic overwhelms most readers.
This is the British English definition of vast. View American English definition of vast.
someone who studies the stars and planets using scientific equipment including telescopes