At a given point, the angle between magnetic north and true north. / At a given point, the angle between the line connecting this point with the geographical center of the earth and the equatorial plane.

plural of declination

Relating to declination.

(grammar) Capable of being declined.

A pessimistic belief that things are in decline.

(heraldry) Having the tail hanging down.

An instrument for taking the declination or angle which a plane makes with the horizontal plane. / (obsolete) A dissenter.

declinate

Having a decline or slope.

(rare) The act of declining or refusing.