vacuum
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Voiced labiodental fricative. Examples: van, have, of
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1. (n) Một vùng không gian chứa đựng không quan trọng. 2. (n) Tình trạng hiếm gặp, hoặc giảm áp suất dưới bầu khí quyển, trong một bình, chẳng hạn như ngưng tụ động cơ hơi nước, gần như kiệt sức vì không khí hoặc hơi nước, v.v... 3. (v) ( Chuyển) để làm sạch (một cái gì đó) với một chân không c
1. (n) A region of space that contains no matter. 2. (n) The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, such as the condenser of a steam engine, which is nearly exhausted of air or steam, etc. 3. (v) (transitive) To clean (something) with a vacuum cleaner. 4. (v) (intransitive) To use a vacuum cleaner. 5. (n) An emptiness in life created by a loss of a person who was close, or of an occupation. 6. (n) An exercise in which one draws their abdomen towards the spine. 7. (n) (physics) A spacetime having tensors of zero magnitude. 8. (n) (physics) A ground state of a quantum field or of local spacetime, or more abstractly the lowest-energy state of a system. 9. (n) (string theory) A description of spacetime resulting from a particular compactification of spatial dimensions. 10. (v) (transitive, databases) To optimise a database or database table by physically removing deleted tuples. 11. (n) (colloquial, only pluralized as "vacuums") Ellipsis of vacuum cleaner. [A device that uses suction, and often agitation, in order to remove dirt and other debris from carpets and hard floors.]
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