Technically, a formula of the propositional calculus that is true whatever the truth-value assigned to its constituent propositional variables. (A tautology is thus valid, or true in all interpretations .) In more informal contexts a tautology is often thought of as a proposition that ‘says nothing’, or merely repeats a definition.

Philosophy dictionary. . 2011.

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(of the same idea in different words), , , ,

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  • Tautology — may refer to: Tautology (rhetoric), using different words to say the same thing even if the repetition does not provide clarity. Tautology also means a series of self reinforcing statements that cannot be disproved because the statements depend… …   Wikipedia

  • Tautology — Tau*tol o*gy, n. [L. tautologia, Gr. ?: cf. F. tautologie.] (Rhet.) A repetition of the same meaning in different words; needless repetition of an idea in different words or phrases; a representation of anything as the cause, condition, or… …   The Collaborative International Dictionary of English

  • tautology — is the repetition of the same idea or meaning in a phrase or sentence, as in a free gift (all gifts are free), a new innovation, and to return again. Some tautologies are contained within a small group of words such as a noun phrase (e.g. future… …   Modern English usage

  • tautology — I noun battology, duplication, loquacity, pleonasm, profuseness, redundancy, repetition, superfluousness, surfeit, verbiage, verbosity II index redundancy Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • tautology — (n.) 1570s, from L.L. tautologia representation of the same thing (c.350), from Gk. tautologia, from tautologos repeating what has been said, from tauto the same + logos saying, related to legein to say (see LECTURE (Cf. lecture) (n.)) …   Etymology dictionary

  • tautology — *verbiage, redundancy, pleonasm, circumlocution, periphrasis …   New Dictionary of Synonyms

  • tautology — ► NOUN (pl. tautologies) ▪ the saying of the same thing over again in different words, considered as a fault of style (e.g. they arrived one after the other in succession). DERIVATIVES tautological adjective tautologous adjective. ORIGIN from… …   English terms dictionary

  • tautology — [tô täl′ə jē] n. pl. tautologies [LL tautologia < Gr: see TAUTO & LOGY] 1. a) needless repetition of an idea in a different word, phrase, or sentence; redundancy; pleonasm (Ex.: “necessary essentials”) b) an instance of such repetition 2.… …   English World dictionary

  • tautology — tautological /tawt l oj i keuhl/, tautologic, tautologous /taw tol euh geuhs/, adj. tautologically, tautologously, adv. tautologist, n. /taw tol euh jee/, n., pl. tautologies. 1. needless repetition of an idea, esp. in wo …   Universalium

  • tautology — noun /tɔˈtɒl.ə.dʒi/ a) redundant use of words It is tautology to say, Forward Planning . b) An expression that features tautology. The expression raze to the ground is a tautology, since the word raze includes the notion to the ground . Ant …   Wiktionary

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