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grid variation: Meaning and Definition of

grid' varia"tion

Pronunciation: [key]
— Navig. Navig.
  1. the angle, at any point on the surface of the earth, between the magnetic and true meridians passing through that point. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
grid road grief
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