English Dictionary

tautology

/tɔˈtɒl.ə.d͡ʒi/

noun

(uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition. / (countable) An expression that features tautology.

Using the phrase 'free gift' is a tautology.

意味（1）

(uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition.

It is tautology to say, Forward Planning.

意味（2）

(countable) An expression that features tautology.

The expression raze to the ground is a tautology, since the word raze includes the notion to the ground.

意味（3）

(countable, logic, propositional logic) A statement that is true for all truth values of its propositional variables.

意味（4）

(countable, logic, first-order logic) A statement that is true for all truth values of its Boolean atoms.