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vacuum
noun (vacuums or technical vacua )
1 a space from which all matter has been removed.
2 a space from which all or almost all air or other gas has been removed.
3 a feeling or state of emptiness.
4 a condition of isolation from outside influences.
5 colloq a vacuum cleaner.
adjective relating to, containing or operating by means of a vacuum a vacuum pump .
verb (vacuumed , vacuuming ) tr & intr , colloq to clean with a vacuum cleaner.
[16c: from Latin vacuus empty]
noun (vacuums or technical vacua )
1 a space from which all matter has been removed.
2 a space from which all or almost all air or other gas has been removed.
3 a feeling or state of emptiness.
4 a condition of isolation from outside influences.
5 colloq a vacuum cleaner.
adjective relating to, containing or operating by means of a vacuum a vacuum pump .
verb (vacuumed , vacuuming ) tr & intr , colloq to clean with a vacuum cleaner.
[16c: from Latin vacuus empty]
vacuum brake
noun a brake in the working of which suction by vacuum supplements the pressure applied by the operator, especially a braking system of this type applied simultaneously throughout a train.
noun a brake in the working of which suction by vacuum supplements the pressure applied by the operator, especially a braking system of this type applied simultaneously throughout a train.
vacuum cleaner
noun an electrically powered cleaning device that lifts dust and dirt by suction. See also Hoover, vacuum.
[Early 20c]
vacuum-clean verb .
noun an electrically powered cleaning device that lifts dust and dirt by suction. See also Hoover, vacuum.
[Early 20c]
vacuum-clean verb .
vacuum flask
noun a container for preserving the temperature of liquids, especially drinks, by means of a vacuum lining. See also Thermos.
[Early 20c]
noun a container for preserving the temperature of liquids, especially drinks, by means of a vacuum lining. See also Thermos.
[Early 20c]
vacuum tube
noun
1 elec an electron tube containing an electrically heated electrode (the cathode) that emits electrons which flow through a vacuum to a second electrode (the anode). Also called valve.
2 a thermionic valve.
noun
1 elec an electron tube containing an electrically heated electrode (the cathode) that emits electrons which flow through a vacuum to a second electrode (the anode). Also called valve.
2 a thermionic valve.
© Hodder Education
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