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principal meridian

   Also found in: Financial, Wikipedia 0.01 sec.
principal meridian [′prin·sə·pəl mə′rid·ē·ən]
(civil engineering)
One of the meridians established by the United States government as a reference for subdividing public land.
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At that time a survey would happen and thus, in 1815 two men were hired to establish accurately the location of the base line and the principal meridian which are preserved by this marker.
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Mixed astigmatism or irregular astigmatism describes the unequal curvature of the cornea in which one principal meridian is myopic and the other is hyperopic.
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