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length

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noun American English pronunciation: length /leŋθ/ 
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singularlength
plurallengths
  1. 1
    [countable/uncountable] a measurement of how long something is in size

    Cut the cloth to the required length.

    This beautiful bird is small, with a total length of about three inches.

    The length of your swimming pool is not important.

    of equal/unequal length:

    Use two planks of unequal length.

    in length:

    The boat was 16 feet in length.

    1. a.
      a measurement of how long something is in time

      The length of your talk must be at least 10 minutes.

      The average length of stay in hospital is three days.

      length of time:

      You can adjust the length of time that the light remains on.

      for any length of time (=for a long period of time):

      When standing for any length of time, remember to flex your knees.

    2. b.
      a measurement of how big a book or piece of writing is

      His latest novel is twice the length of his previous one.

  2. 2
    [countable] [usually singular] the distance from one end of something to the other

    Carter ran half the length of the field to score.

    along something's length:

    The pier was lit up along its entire length.

    run the length of something (=go from one end to the other):

    A proposed tourist trail will run the length of the river.

  3. 4
    [countable] a measure of how far one car, horse, etc. is in front of another in a race, usually equal to the length of one car, horse, etc.

    He still managed to finish seven lengths ahead of the rest.

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