Etymology
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vacuity (n.)

late 14c., "hollow space," from Latin vacuitas "empty space, emptiness, absence, vacancy, freedom," from vacuus "empty," from PIE *wak-, extended form of root *eue- "to leave, abandon, give out." Originally in anatomy. Meaning "vacancy of mind or thought" is attested from 1590s.

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Definitions of vacuity

vacuity (n.)
the absence of matter;
Synonyms: vacuum
vacuity (n.)
a region that is devoid of matter;
Synonyms: vacuum
vacuity (n.)
total lack of meaning or ideas;
Synonyms: inanity / senselessness / mindlessness / pointlessness
From wordnet.princeton.edu