Princeton's WordNet

1. vacuum, vacuity(noun)

   the absence of matter

2. void, vacancy, emptiness, vacuum(noun)

   an empty area or space

   "the huge desert voids"; "the emptiness of outer space"; "without their support he'll be ruling in a vacuum"

3. vacuum, vacuity(noun)

   a region that is devoid of matter

4. vacuum, vacuum cleaner(verb)

   an electrical home appliance that cleans by suction

5. vacuum, vacuum-clean, hoover(verb)

   clean with a vacuum cleaner

   "vacuum the carpets"

Kernerman English Learner's Dictionary

1. vacuum(noun)ˈvæk yum, -yu əm, -yəm

   a machine used to clean floors

2. vacuumˈvæk yum, -yu əm, -yəm

   a space from which all air and other substances have been removed

   to create a vacuum

3. vacuum(verb)ˈvæk yum, -yu əm, -yəm

   to clean using a vacuum

   Did you vacuum the hall?

Wiktionary

1. vacuum(Noun)

   A region of space that contains no matter.

2. vacuum(Noun)

   A vacuum cleaner.

3. vacuum(Verb)

   To clean (something) with a vacuum cleaner.

4. vacuum(Verb)

   To use a vacuum cleaner.

Origin: From vacuum, noun use of neuter of vacuus, related to vaco

Webster Dictionary

1. Vacuum(noun)

   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; as, water boils at a reduced temperature in a vacuum

2. Vacuum(noun)

   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.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch

U.S. National Library of Medicine

1. Vacuum

   A space in which the pressure is far below atmospheric pressure so that the remaining gases do not affect processes being carried on in the space.

The Standard Electrical Dictionary

1. Vacuum

   A space destitute of any substance. The great pervading substance is in general sense the atmosphere. It is the gaseous mixture which surrounds and envelopes the earth and its inhabitants. It consists of a simple mixture of oxygen, 1 part, nitrogen, 4 parts, with 4 to 6 volumes of carbonic acid gas in 10,000 volumes of air, or about one cubic inch to one cubic foot. It presses with a force of about 14.7 lbs. per square inch under the influence of the force of gravity. The term vacuum in practise refers to any space from which air has been removed. It may be produced chemically. Air may be displaced by carbonic acid gas and the latter may be absorbed by caustic alkali or other chemical. The air may be expelled and the space may be filled with steam which is condensed to produce the vacuum. Of course in all cases the space must be included in an hermetically sealed vessel, such as the bulb of an incandescent lamp. But the universal method of producing a vacuum is by air pumps. An absolute vacuum means the entire absence of gas or air, something almost impossible to produce. A high vacuum is sometimes understood to mean one in which the path of the molecules is equal in length to the diameter of the containing vessels, as in Crookes' Radiometer and other apparatus for illustrating the radiant condition of matter. The air left after exhaustion is termed residual air or residual atmosphere. [Transcriber's note: Dry air is about .78 nitrogen, .21 oxygen, .01 argon, .00038 carbon dioxide, and trace amounts of other gases. Argon was suspected by Henry Cavendish in 1785. It was discovered in 1894 by Lord Rayleigh and Sir William Ramsay.]

• vakuumAfrikaans
• خَواء، فَراغArabic
• вакуумBulgarian
• vácuoPortuguese (BR)
• vzduchoprázdnoCzech
• das VakuumGerman
• lufttomt rum; vakuumDanish
• κενό αέροςGreek
• vacíoSpanish
• vaakumEstonian
• خلاءFarsi
• tyhjiöFinnish
• videFrench
• ריקHebrew
• शून्य स्थानHindi
• vakumCroatian
• vákuumHungarian
• ruang hampa udaraIndonesian
• lofttæmiIcelandic
• vuotoItalian
• 真空Japanese
• 진공Korean
• vakuumasLithuanian
• vakuumsLatvian
• hampa gas; vakumMalay
• vacuümDutch
• lufttomt rom, vakuumNorwegian
• próżniaPolish
• vácuoPortuguese
• vidRomanian
• вакуумRussian
• vzduchoprázdnoSlovak
• vakuumSlovenian
• vakuumSerbian
• vakuumSwedish
• สุญญากาศThai
• boşluk, vakumTurkish
• 真空Chinese (Trad.)
• вакуумUkrainian
• ہوا سے خالي جگہ، خلاUrdu
• chân khôngVietnamese
• 真空Chinese (Simp.)