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meridians Definition

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meridians
noun(me-rid-i-an)
a great circle on the surface of the earth passing through the poles
meridians
noun(me-rid-i-an)
the half of such a circle included between the poles
meridians
noun(me-rid-i-an)
a representation of such a circle or half circle numbered for longitude on a map or globe
meridians
noun(me-rid-i-an)
the meridian of 0 degrees longitude which runs through the original site of the Royal Observatory at Greenwich, England, and from which other longitudes are reckoned

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