I. ˈvast adjective
Etymology: Latin vastus; akin to Old High German wuosti empty, desolate, Old Irish fás
Date: 1585
: very great in size, amount, degree, intensity, or especially in extent or range
vast knowledge
a vast expanse
Synonyms: see enormous
• vast·ly adverb
• vast·ness ˈvas(t)-nəs noun
II. noun
Date: 1604
: a boundless space
the vast of heaven — John Milton