Tautology

Noun

  • (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"."

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

    "A tautology can be verified by constructing a truth tree for its negation: if all of the leaf nodes of such truth tree end in X's, then the original (pre-negated) formula is a tautology."

  • (uncountable) Redundant use of words.

    "It is tautology to say, "Forward Planning"."

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

    "A logical statement which is neither a tautology nor a contradiction is a contingency."

  • "Given a Boolean A, "A OR (NOT A)" is a tautology."

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