from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Absence of matter.
  • n. A space empty of matter.
  • n. A space relatively empty of matter.
  • n. A space in which the pressure is significantly lower than atmospheric pressure.
  • n. A state of emptiness; a void.
  • n. A state of being sealed off from external or environmental influences; isolation.
  • n. A vacuum cleaner.
  • adj. Of, relating to, or used to create a vacuum.
  • adj. Containing air or other gas at a reduced pressure.
  • adj. Operating by means of suction or by maintaining a partial vacuum.
  • transitive v. To clean with or use a vacuum cleaner.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A region of space that contains no matter.
  • n. A vacuum cleaner.
  • v. To clean (something) with a vacuum cleaner.
  • v. To use a vacuum cleaner.

from the GNU version of the Collaborative International Dictionary of English

  • n. A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means.
  • n. The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc..

from The Century Dictionary and Cyclopedia

  • n. Empty space; space void of matter: opposed to plenum; in practical use, an inclosed space from which the air (or other gas) has been very nearly removed, as by an air-pump.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the absence of matter
  • v. clean with a vacuum cleaner
  • n. a region that is devoid of matter
  • n. an electrical home appliance that cleans by suction
  • n. an empty area or space


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin, empty space, from neuter of vacuus, empty, from vacāre, to be empty.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin vacuum ("an empty space, void"), noun use of neuter of vacuus ("empty"), related to vacare ("be empty")


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  • And, in truth, by the term vacuum in its common use, we do not mean

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  • Removing the bugs with a vacuum is the best way to go, says Michael Raupp, a professor of entomology at the University of Maryland.

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  • A. the speed of light in a vacuum is about 670,616,629.2 miles per hour or 983,571,056 feet per second, which is about 186,282.397 miles per second, or roughly one foot per nanosecond. the speed of sound?

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  • Frustrated with what he calls a vacuum in leadership, he has turned to other mayors, an effort the National Rifle Association calls -- quote -- "a publicity stunt."

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  • "So, then," objected Willis, "if two persons were to talk in what you call a vacuum, they would not hear each other?"

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  • Thus it can be seen that Newton was of the opinion that heat consists in a minute vibratory motion of the particles of bodies, and that such motion was communicated through what he calls a vacuum by the vibrations of an elastic medium, the

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  • The natural agency for filling this vacuum is the League of Nations - (Hear, hear) - which is not purely a European concern belonging to certain states, but is an organization for filling the vacuum created by the disappearance of that old European system in which the autocracies were more powerful than the democracies.

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  • The mode by which we obtain what I term a vacuum is, it is believed, entirely new, as is also the method of letting the water into it, and throwing it off against the atmosphere without any friction.

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  • In asking whether the gods of the theologians be by chance the abstract being which they call the vacuum or space, they will reply, no! They will further insist, that their gods, who are not matter, penetrate that which is matter.

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  • Ahh fond memory... winning a bet over the correct spelling of this word.

    April 3, 2013

  • "Practically, the degree of exhaustion obtained falls short of that demanded by theory, owing to the imperfections of the machine; thus, in the common form, the exhaustion is limited to the point where the remaining air has not sufficient elasticity to raise the valves." -- from the Cent. Dict.

    August 4, 2011