Definition of vastness in US English:

vastness

noun

  • Very great extent or size; immensity.

    ‘the vastness of the Atlantic Ocean’
    ‘the sheer vastness of the building takes your breath away’
    ‘Brian was overwhelmed by the vastness of the occasion’
    • ‘Romantic painters often positioned small figures within vast landscape panoramas to instill awe at the vastness of nature.’
    • ‘They once again set out to explore the vastness of outer space, going further than any other humans have dared go.’
    • ‘Both these artists take on the vastness of the world, undaunted, through quiet, insistent craft.’
    • ‘Set in a snowy vastness, the story is driven by the appearance of an evil spirit.’
    • ‘It represents the ability of the human mind to contain the vastness of belief in God.’

Pronunciation

vastness

/ˈvæs(t)nəs//ˈvas(t)nəs/