This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Absence of matter.

n. A space empty of matter.

n. A space relatively empty of matter.

n. A space in which the pressure is significantly lower than atmospheric pressure.

n. A state of emptiness; a void.

n. A state of being sealed off from external or environmental influences; isolation.

n. A vacuum cleaner.

adj. Of, relating to, or used to create a vacuum.

adj. Containing air or other gas at a reduced pressure.

adj. Operating by means of suction or by maintaining a partial vacuum.

v. To clean with or use a vacuum cleaner.

n. A region of space that contains no matter.

n. A vacuum cleaner.

v. To clean (something) with a vacuum cleaner.

v. To use a vacuum cleaner.

n. 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.

n. 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..

n. Empty space; space void of matter: opposed to plenum; in practical use, an inclosed space from which the air (or other gas) has been very nearly removed, as by an air-pump.

n. the absence of matter

v. clean with a vacuum cleaner

n. a region that is devoid of matter

n. an electrical home appliance that cleans by suction

n. an empty area or space

"I bet there is some really elegant solution to mechanically actuating something in vacuum from a pressurized environment but I can't think of it immediately."

plenum   

vacuumed    vacuuming    vacuums   

emptiness    clean    make clean    region    part    space   

emptiness    guerickian vacuum    vacuum effect    high vacuum    low vacuum    vaauum dredging-machine    geissler's vacuum    vacuum distillation    absolute vacuum    crookes's vacuum   

vacua   

vacuum cleaner    power vacuum   

void    vacancy    vacuity    voidness    hoover    to    hoovering   

hydraulic    suction    gas    pressure    oxygen    steam    radiation    electric    emergency    thermal