Very great in size, number, amount, or quantity.(adjective)
Very great in area or extent; immense.(adjective)
Very great in degree or intensity. See Synonyms at enormous.(adjective)
Archaic An immense space.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "vast" in a sentence
"Some of the phrases they gave me, such as the phrase "vast majority" used twice were pretty vague, and because I hadn't seen the actual language, I was reporting only what I was told, but it sounded like we were headed toward fairly tight release language on the settlement."
"Minow coined the phrase "vast wasteland" in 1961, he was referring to television."
"The English word vast is derived from the Sanskrit vas, so Vasudeva also means that vast and all-encompassing Supreme Being within whom all other beings are contained."