substitutivity

/ (ˌsʌbstɪtjuːˈtɪvɪtɪ) /

noun

logic philosophy the principle that expressions with the same reference can be substituted for one another without affecting the truth-value of any context in which they occurSee also transparent context, opaque context

QUIZZES

CAN YOU FEEL THE WEAL WITH THIS WORD OF THE DAY QUIZ?

Did you collect all of last week’s words, but eftsoons forget what they mean? Don’t worry, we’re here to jog your memory. See how many words from the week of May 18 to 24 you can get right!
Question 1 of 7
weal
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