Definitions for "magnetic variation"
Difference between true north and magnetic north, varying with position; magnetic variation drifts with time.
the difference between true/grid north and magnetic north.
the angle (at a particular location) between magnetic north and true north
Same as magnetic declination.
See declination.
Used as a synonym for magnetic declination but, more specifically, to indicate changes in this relationship within certain time limits i.e. temporal variation.