English

Noun

magnetic deviation ‎(plural magnetic deviations)

1. Used other than as an idiom: see magnetic,‎ deviation.
   • 1904, Ernest Rutherford, Radio-activity, Dover, 2004, page 117,

     Preliminary experiments with radium of activity 1000 showed that it was very difficult to determine the magnetic deviation of the α rays.

2. Magnetic declination.
   • 1998, John R. Ellis, Objectifying Real-Time Systems, page 483,

     This angular difference is the local magnetic deviation (Figure C.2). Navigation systems normally work relative to True North and therefore must remove the local magnetic deviation.

Synonyms

• (magnetic declination): magnetic declination, magnetic variation