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  1. Oxford Dictionary

    mean sea level

    • n.
      the sea level halfway between the mean levels of high and low water.

    • noun: mean sea level, plural noun: mean sea levels

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    mean sea level

    • IPA[ˌmēn ˈsē ˌlevəl]
    • n.
      the sea level halfway between the mean levels of high and low water.

    Oxford American Dictionary