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vast (adj.)

1570s, "being of great extent or size," from Middle French vaste, from Latin vastus "immense, extensive, huge," also "desolate, unoccupied, empty." The two meanings probably originally attached to two separate words, one with a long -a- one with a short -a-, that merged in early Latin (see waste (v.)). Meaning "very great in quantity or number" is from 1630s; that of "very great in degree" is from 1670s. Very popular early 18c. as an intensifier. Related: Vastly; vastness; vasty.

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Definitions of vast from WordNet

vast (adj.)
unusually great in size or amount or degree or especially extent or scope; "the vast accumulation of knowledge...which we call civilization"- W.R.Inge;
at vast (or immense) expense
the vast reaches of outer space
Synonyms: huge / immense / Brobdingnagian
From wordnet.princeton.edu