Declination

Noun

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. The gradual decline in the overall fundamental frequency or pitch of speech over the course of an utterance, independent of local variations such as tones and pitch accents.
5. Declension.