At a given point, the angle between magnetic north and true north. (noun)
At a given point, the angle between the line connecting this point with the geographical center of the earth and the equatorial plane. (noun)
A refusal. (noun)
Examples of word declination
Between sunrise and the declination is the Sunnat-time, and therefore the best.
 The declination is the variation of the needle from the true meridian of a place.
One of the many methods adopted for mounting equatorials is that exhibited -- with the omission of some minor details -- in fig. 9. _a_ is the polar axis, _b_ is the axis (called the declination axis) which bears the telescope.
To learn this we must take out Mercury's declination, which is 24° 43 '18 "N., and the sun's, which is 22° 59' 10 "N.
It has also another variation, called the declination, or dip.