magnetic variation

from WordNet (r) 3.0 (2006)

magnetic variation
    n 1: the angle (at a particular location) between magnetic north
         and true north [syn: {magnetic declination}, {magnetic
         variation}, {variation}]

from The Collaborative International Dictionary of English v.0.48

magnetic declination \magnetic declination\ n.
   The angle (at a particular location) between magnetic north
   and true north; called also {magnetic variation}.
   [WordNet 1.5]

from The Collaborative International Dictionary of English v.0.48

magnetic variation \magnetic variation\ n.
   Same as {magnetic declination}.
   [WordNet 1.5]

[email protected]