A Declination

1. At a given point, the angle between magnetic north and true north.
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. A refusal.
4. (grammar, obsolete) Declension.
5. (archaic) The act or state of bending downward; inclination.
6. (archaic) The act or state of falling off or declining from excellence or perfection; deterioration; decay; decline.
7. (archaic) Deviation