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4 definitions found
 for vacuum
From The Collaborative International Dictionary of English v.0.48 :

  Vacuum \Vac"u*um\ (v[a^]k"[-u]*[u^]m), n.; pl. E. Vacuums
     (v[a^]k"[-u]*[u^]mz), L. Vacua (v[a^]k"[-u]*[.a]). [L., fr.
     vacuus empty. See Vacuous.]
     1. (Physics) 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.
        [1913 Webster]
        [1913 Webster]
     2. 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.
        [1913 Webster]
     Vacuum brake, a kind of continuous brake operated by
        exhausting the air from some appliance under each car, and
        so causing the pressure of the atmosphere to apply the
     Vacuum pan (Technol.), a kind of large closed metallic
        retort used in sugar making for boiling down sirup. It is
        so connected with an exhausting apparatus that a partial
        vacuum is formed within. This allows the evaporation and
        concentration to take place at a lower atmospheric
        pressure and hence also at a lower temperature, which
        largely obviates the danger of burning the sugar, and
        shortens the process.
     Vacuum pump. Same as Pulsometer, 1.
     Vacuum tube (Phys.),
        (a) a glass tube provided with platinum electrodes and
            exhausted, for the passage of the electrical
            discharge; a Geissler tube.
        (a) any tube used in electronic devices, containing a
            vacuum and used to control the flow of electrons in a
            circuit, as a vacuum diode, triode, tetrode, or
     Vacuum valve, a safety valve opening inward to admit air to
        a vessel in which the pressure is less than that of the
        atmosphere, in order to prevent collapse.
     Torricellian vacuum. See under Torricellian.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Vacuum cleaner \Vac"u*um clean"er\
     A machine for cleaning carpets, tapestry, upholstered work,
     etc., by suction; -- sometimes called a vacuum.
     [Webster 1913 Suppl.]

From WordNet (r) 3.0 (2006) :

      n 1: the absence of matter [syn: vacuum, vacuity]
      2: an empty area or space; "the huge desert voids"; "the
         emptiness of outer space"; "without their support he'll be
         ruling in a vacuum" [syn: void, vacancy, emptiness,
      3: a region that is devoid of matter [syn: vacuum, vacuity]
      4: an electrical home appliance that cleans by suction [syn:
         vacuum, vacuum cleaner]
      v 1: clean with a vacuum cleaner; "vacuum the carpets" [syn:
           vacuum, vacuum-clean, hoover]

From Moby Thesaurus II by Grady Ward, 1.0 :

  43 Moby Thesaurus words for "vacuum":
     absence, absence of mind, blank, blankness, broom, brush,
     brush off, clean slate, deprivation, emptiness, empty space,
     empty-headedness, hollowness, inanity, jejunity, mental void,
     negation, negativeness, negativity, nihility, nonbeing, nonentity,
     nonexistence, nonoccurrence, nonreality, nonsubsistence, not-being,
     nothing, nothingness, nullity, sweep, sweep out, sweep up,
     tabula rasa, unactuality, unreality, vacancy, vacuity, vacuousness,
     vacuum-clean, vapidity, void, whisk

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