8
A logical statement in which the conclusion is equivalent to the premise
Example of a tautology: Bad people take drugs; therefore, people who take drugs are bad.
The other definition appearing here, "Unnecessary repetition of a word", is a crudification and wrong - such pointless reiterative repetition is a redundancy, and one who makes such a definition is called a "redundunce". Consult Fowler.
by Slick Willy March 16, 2005
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9
the explanation of a word by using the word itself.
What is a tautology?
a tautology.
by stickywulf October 23, 2005
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10
A tautology is a reiteration of a term using one or more different successive synonyms.
Examples of tautology:

It was a wet rainy day with lots of precipitation.
She is a female woman of the opposite sex, John.
We could see some dilapidated ruins.
by Fearman December 03, 2007
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