(in the theory of classes) the class that includes all other classes and is composed of all individuals composing these classes.
Decoding The Words From Your Last Yoga ClassAs yoga has become popular in English-speaking countries, English words now accompany the Sanskrit pose names.
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British Dictionary definitions for universal class
(in Boolean algebra) the class containing all points and including all other classes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012