Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for vacuum from the 1913 edition of Webster's Revised Unabridged Dictionary. Define vacuum using one of the most comprehensive free online dictionaries on the web.

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vacuum
Part of Speech: noun
Results: 2
1. 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.
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