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likelihood

n.
US //ˈɫaɪkɫiˌhʊd// UK //lˈaɪklihˌʊd// like·li·hood
  1. 1 probability (n.)
    B2 Upper Intermediate

    the chance that something will happen.

    the probability of a specified outcome or the state of being probable.

    Example

    There is a high likelihood of rain this afternoon, so you should take an umbrella.

    Example

    Given the current economic climate, there is a strong likelihood that interest rates will remain stable for the remainder of the fiscal year.

    Usage

    Commonly used in the phrase 'in all likelihood' to mean 'very probably'.

    Pitfall
    There is a high likelihood for rain today.
    There is a high likelihood of rain today.

    The noun likelihood is almost always followed by the preposition 'of' or a 'that' clause.

  2. 2 statistical probability (n.)
    C1 Advanced Technical Math

    a measurement in math used to see how well a model fits the data you have.

    the probability that a particular set of observed data was generated by a specific statistical model or parameter.

    Example

    The scientist calculated the likelihood to see which theory best explained the results.

    Example

    The maximum likelihood estimation provides a method for finding the parameter values that make the observed data most probable.

    Usage

    Often used as a technical term in 'maximum likelihood estimation'.

    • probability function
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  1. 3 resemblance (n.)
    C2 Proficiency Archaic

    the quality of looking like someone or something else.

    the state of being similar in appearance or character; likeness.

    Example

    The old painting showed a clear likelihood to the king's younger brother.

    Example

    The poet remarked upon the strange likelihood between the fading autumn leaves and the passing of human youth.

    Teacher's tip

    This sense is archaic; modern speakers use 'likeness' or 'resemblance' instead.

Origin

From Middle English liklihode, equivalent to likely + -hood.

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