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paradox

n.
US //ˈpɛɹəˌdɑks// UK //pˈæɹədˌɒks// para·dox
  1. 1 logical contradiction (n.)
    B2 Upper Intermediate Academic Science

    a statement that seems to say two opposite things at once, making it seem impossible.

    a statement that is apparently self-contradictory or logically unacceptable but may express a latent truth.

    Example

    The 'liar paradox' is a famous example: if I say 'I am lying,' am I telling the truth?

    Example

    The twin paradox in physics challenges our intuitive understanding of time by suggesting that a space traveller would age more slowly than their earthbound sibling.

    Usage

    Often used with 'the' to refer to specific named problems in logic or science.

  2. 2 contradictory situation (n.)
    B2 Upper Intermediate

    a situation that has two opposite qualities that make it difficult to understand.

    a situation or event that combines contradictory features or qualities.

    Example

    It is a paradox that such a wealthy country has so many people living in poverty.

    Example

    The paradox of the modern workplace is that despite having more labour-saving technology than ever, employees report feeling more overworked than previous generations.

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  1. 3 contradictory person (n.)
    C1 Advanced Literary

    a person who has qualities that do not seem to go together.

    a person whose character or behaviour is composed of seemingly incompatible traits.

    Example

    He is a paradox: a very shy man who loves performing on stage in front of thousands.

    Example

    The novelist was a fascinating paradox, known for her ruthless public persona while privately maintaining a reputation for extraordinary generosity and warmth.

Origin

From Middle French paradoxe, from Latin paradoxum, from Ancient Greek παράδοξος (parádoxos, “unexpected, strange”).

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