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reference

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noun American English pronunciation: reference /ˈref(ə)rəns/ 
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singularreference
pluralreferences
 
  1. 1
    [countable/uncountable] a comment that mentions someone or something
    reference to:

    The title is apparently a reference to the singer's brother.

    make a/no reference to:

    He politely made no reference to my messy appearance.

    passing reference (=a quick comment about someone or something):

    Her speech contained only a passing reference to tax reform.

  2. 2
    [uncountable] the process of looking at something in order to get information

    The sentences are numbered for ease of reference.

    1. a.
  3. 4
    [countable] a word or phrase that comes from a book or a poem

    His writing is full of obscure literary references.

  4. 5
    [countable] a writer or a piece of work that is mentioned in a piece of writing by someone else

    There was a long list of references at the end of the paper.

  5. 6
    [countable] a number or symbol that shows someone where they can find information that they need
    reference number:

    Please quote your customer reference number if you need to contact us.

    Start your walk at map reference 2D.

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