Decline
Part of speech: noun
Definition: Downward movement, fall. A sloping downward, e.g. of a hill or road. A weakening. A reduction or diminution of activity.
Part of speech: verb
Definition: To move downwards, to fall, to drop. To become weaker or worse. To refuse. To list the inflected forms of a noun, pronoun (and in some languages adjective) for case and number.
Example sentence: Land and sea, weakness and decline are great separators, but death is the great divorcer for ever.
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.