Etymology
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tautology (n.)

"repetition of the same word, or use of several words conveying the same idea, in the same immediate context; repetition of the same thing in different words; the useless repetition of the same idea or meaning," 1570s, from Late Latin tautologia "representation of the same thing in other words," from Greek tautologia, from tautologos "repeating what has been said," from tauto "the same" (contraction of to auto, with to "the" + auto, see auto-) + -logos "saying," related to legein "to say," from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Related: Tautological.

updated on December 03, 2018

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Definitions of tautology from WordNet

tautology (n.)
(logic) a statement that is necessarily true;
the statement `he is brave or he is not brave' is a tautology
tautology (n.)
useless repetition;
to say that something is `adequate enough' is a tautology
From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near tautology

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tax