|Depression (De*pres"sion) (?), n.
[L. depressio: cf. F. dépression.]
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. "In a great depression of spirit." Baker.
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 degreees 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.
Synonyms -- Abasement; reduction; sinking; fall; humiliation; dejection; melancholy.
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