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  1. Oxford Dictionary

    Arctic Circle

    • IPA[ˌɑːktɪk ˈsəːkl]

    英式

    • ph.
      the parallel of latitude 66° 33ʹ north of the equator. It marks the northernmost point at which the sun is visible at the northern winter solstice and the southernmost point at which the midnight sun can be seen at the northern summer solstice.