declination

noun

1. 1

   At a given point, the angle between magnetic north and true north.

2. 2

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

3. 3

   A refusal.

4. 4

   (grammar) Declension.

5. 5

   The act or state of bending downward; inclination.

   “declination of the head”

6. 6

   The act or state of falling off or declining from excellence or perfection; deterioration; decay; decline.

7. 7

   Deviation.