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Necessary truth

SEMANTICS: a sentence which is true by virtue of its logical structure. EXAMPLE: sentence (i) is necessarily true due to the meaning of the logical constants every, or, independently of the words raven and black:

(i) Every raven is black or not black
Sentence (i) is also called a tautology. All sentences that are not necessarily true are contingently true (see contingent truth). See also analytic truth.
LIT. Gamut, L.T.F. (1991)