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substitutivity

/ˌsʌbstɪtjuːˈtɪvɪtɪ/
noun
1.
(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 occur See also transparent context, opaque context
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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