The difference between Contradiction and Tautology

When used as nouns, contradiction means the act of contradicting, whereas tautology means redundant use of words, a pleonasm, an unnecessary and tedious repetition.

check bellow for the other definitions of Contradiction and Tautology

  1. Contradiction as a noun (countable, uncountable):

    The act of contradicting.

    Examples:

    "His contradiction of the proposal was very interesting."

  2. Contradiction as a noun (countable):

    A statement that contradicts itself, i.e., a statement that makes a claim that the same thing is true and that it is false at the same time and in the same senses of the terms.

    Examples:

    "There is a contradiction in Clarence Page's statement that a woman should have the right to choose and decide for herself whether to have an abortion, and at the same time she should not have that right."

    "There is a contradiction in what you say: she can't be both married and single."

  3. Contradiction as a noun (countable):

    A logical inconsistency among two or more elements or propositions.

    Examples:

    "Marx believed that the contradictions of capitalism would lead to socialism."

  4. Contradiction as a noun (logic, countable):

    A proposition that is false for all values of its variables.

  1. Tautology as a noun (uncountable):

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

    Examples:

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

  2. Tautology as a noun (countable):

    An expression that features tautology.

    Examples:

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

  3. Tautology as a noun (countable, logic):

    In propositional logic: a statement that is true for all truth values of its propositional variables. In first-order logic: a statement that is true for all truth values of its Boolean atoms.

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