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exˌtensioˈnality

/ ɪkˌstɛnʃəˈnælɪtɪ /

noun

  1. logic the principle that sets are definable in terms of their elements alone, whatever way they may have been selected. Thus {a, b}={b, a}={first two letters of the alphabet}
“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


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