Depression

1. The act of depressing.
2. The state of being depressed; a sinking.
3. A falling in of the surface; a sinking below its true place; a cavity or hollow; as, roughness consists in little protuberances and depressions.
4. Humiliation; abasement, as of pride.
5. Dejection; despondency; lowness.
6. Diminution, as of trade, etc.; inactivity; dullness.
7. (Astron.) The angular distance of a celestial object below the horizon.
8. (Math.) The operation of reducing to a lower degree; -- said of equations.
9. (Surg.) A method of operating for cataract; couching. See Couch, v. t., 8.
Angle of depression (Geod.),
one which a descending line makes with a horizontal plane.
Depression of the dewpoint (Meteor.),
the number of degrees that the dew-point is lower than the actual temperature of the atmosphere.
Depression of the pole ,
its apparent sinking, as the spectator goes toward the equator.
Depression of the visible horizon . (Astron.)
Same as Dip of the horizon, under Dip.