noun Logic.
a statement so constructed from other statements that its truth-value depends on the truth-values of the other statements rather than on their meanings.

truth-functional, adjective
truth-functionally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  a function that determines the truth-value of a complex sentence solely in terms of the truth-values of the component sentences without reference to their meaning
2.  a complex sentence whose truth-value is so determined, such as a negation or conjunction

Collins English Dictionary - Complete & Unabridged 10th Edition
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