vacua

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vac·u·a

(văk′yo͞o-ə)

A plural of vacuum.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

vacua

(ˈvækjʊə)

a plural of vacuum

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

References in classic literature ?

Hem believes that in the visible world there are void places-- vacua, and something more--holes, as it were, through which animate and inanimate objects may fall into the invisible world and be seen and heard no more.