How Well Do You Know English Slang?  magnetic declination  noun,
Navigation variation (def 8). Unabridged Cite This Source
British Dictionary definitions for magnetic declination
magnetic declination  the angle that a compass needle makes with
the direction of the geographical north pole at any given point
on the earth's surface Also called declination, magnetic
variation Collins English Dictionary - Complete & Unabridged
2012 Digital Edition Cite This Source magnetic declination in
Science magnetic declination   The horizontal angle between the
true geographic North Pole and the magnetic north pole, as
figured from a specific point on the Earth. Compare magnetic
inclination. The American Heritage® Science Dictionary Cite This
Source  Word of the Day  Difficulty index for magnetic
declination  Few English speakers likely know this word  Word
Value for magnetic  Scrabble Words With Friends