Depression

1. The operation of reducing to a lower degree; -- said of equations.
2. Dejection; despondency; lowness.
3. The angular distance of a celestial object below the horizon.
4. Humiliation; abasement, as of pride.
5. The state of being depressed; a sinking.
6. A falling in of the surface; a sinking below its true place; a cavity or hollow; as, roughness consists in little protuberances and depressions.
7. Diminution, as of trade, etc.; inactivity; dullness.
8. A method of operating for cataract; couching. See Couch, v. t., 8.
9. The act of depressing.