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1. (n.) tautology
needless repetition of an idea in different words, as in “widow woman.”
2. tautology
an instance of such repetition.
3. tautology
Logic.
4. tautology
a compound proposition or propositional form all of whose instances are true, as “A or not A” or “The candidate will win or lose.”
Etymology: (1570–80; < LL tautologia < Gk tautología. See tauto -, -logy)
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| Definition of 'tautology' |
Princeton's WordNet |
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1. (noun) tautology
(logic) a statement that is necessarily true
"the statement `he is brave or he is not brave' is a tautology"
2. (noun) tautology
useless repetition
"to say that something is `adequate enough' is a tautology"
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| Definition of 'tautology' |
Webster Dictionary |
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1. (noun) tautology
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 consequence of itself, as in the following lines: --//The dawn is overcast, the morning lowers,/And heavily in clouds brings on the day. Addison
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Definitions of tautology 
