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tautology
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Sample Sentences Using
tautology -- a logical tautology
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a logical tautology Define
a statement that is necessarily true (such as "She will win the election or she won`t.")
  • She didn’t proved anything. It’s a tautology to propose as a premise that "All men are pigs," and that "Bob is therefore a pig because he’s a man." The "proof" is in the premise—which is to say, there is no proof.
  • As a logical proposition, that paragraph can be reduced to the following: Because A, therefore A—the sort of tautology that would get any high school student a failing grade.
    Michael Elliott  --  Time Inc., "How to Lose Friends and Alienate People" (Dec. 22, 2003)  --  http://www.time.com/time/printout/0,8816,1006489,00.html(retrieved 09/24/08)
  • ...the definition of ’self-interest’ as the pursuit of the fulfillment of preferences is a tautology.
    Sam Vaknin  --  Economics - Psychology’s Neglected Branch  --  http://www.thefreelibrary.com/Economics+-+Psychology's+Neglected+Branch-a01073747047(retrieved 09/24/08)
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To see samples using other meanings of tautology, click a word sense below:
a linguistic tautology Define
useless repetition in different words (such as "unmarried bachelor")
a logical tautology Define
a statement that is necessarily true (such as "She will win the election or she won`t.")
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