Descent
Part of speech: noun
Definition: An instance of descending A way down. A sloping passage or incline. Lineage or hereditary derivation A drop to a lower status or condition.
Example sentence: We twentieth-century Mexicans, even those of pure Indian descent, look on the pre-Columbian world as a world on the other side, not only distant in time but across the cultural divide.
Declination
Part of speech: noun
Definition: 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.A refusal.Declension.