Definition of "vacuum" []

  • Absence of matter. (noun)
  • A space empty of matter. (noun)
  • A space relatively empty of matter. (noun)
  • A space in which the pressure is significantly lower than atmospheric pressure. (noun)
  • A state of emptiness; a void. (noun)
  • A region containing no matter; free 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.

  • A region in which gas is present at a low pressure (noun)
  • The degree of exhaustion of gas within an enclosed space (noun)
  • A sense or feeling of emptiness (noun)
  • Of, containing, measuring, producing, or operated by a low gas pressure (noun)
  • To clean (something) with a vacuum cleaner (verb) (c) HarperCollins Publishers Ltd 2016

Use "vacuum" in a sentence
  • "I bet there is some really elegant solution to mechanically actuating something in vacuum from a pressurized environment but I can't think of it immediately."
  • "And, in truth, by the term vacuum in its common use, we do not mean"
  • "Removing the bugs with a vacuum is the best way to go, says Michael Raupp, a professor of entomology at the University of Maryland."