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

The concept of '''tautology''' has two definitions, one [[philosophy|philosophical]], one [[rhetoric]]al.

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

''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", "secular science" or a "three-sided triangle" (as opposed to "all triangles have three sides", which is a definition).

An example of a rhetorical tautology would be, for instance, a "godless [[atheist]]", "[[secular]] [[science]]" 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.”

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.”

For example, "This candidate will win or will not win.”

For example, "This [[candidate]] will win or will not win.”

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

Another example is "If it [[rain]]s, it will rain."