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A '''tautology''' is a statement that is already true by definition, not because of any logical deduction<ref>http://www.apologetics.org/glossary.html</ref>. For instance, "All triangles have three sides" is an inherently true proposition, but it doesn't tell us anything new.

The concept of '''tautology''' has two definitions, one philosophical, one rhetorical.

 

''Rhetorical tautology'' <ref>http://www.m-w.com</ref>is defined as "needless repetition of an idea, statement, or word".

An example of a rhetorical tautology would be, for instance, a "godless atheist", or a "three-sided triangle" (as opposed to "all triangles have three sides", which is a definition).

 

A ''philosophical tautology'' is <ref>http://www.dictionary.com</ref>"a compound propositional form all of whose instances are true", such as “A or not A.”

Another example is "If it rains, it will rain."

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