D defs.my
Entry 9 senses Webster, 1913

Depression

/dĭp-rĕsh'-ən/ · De·pres·sion · IPA /dəˈpɹɛʃn̩/
01 n. The act of depressing.
  1. 1.
    The act of depressing.
  2. 2.
    The state of being depressed; a sinking.
  3. 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. 4.
    Humiliation; abasement, as of pride.
  5. 5.
    Dejection; despondency; lowness.
    “In a great depression of spirit.” — Baker.
  6. 6.
    Diminution, as of trade, etc.; inactivity; dullness.
  7. 7.
    The angular distance of a celestial object below the horizon.(Astron.)
  8. 8.
    The operation of reducing to a lower degree; -- said of equations.(Math.)
  9. 9.
    A method of operating for cataract; couching. See Couch, v. t., 8.(Surg.) See: Couch
Phrases & compounds
Angle of depression — one which a descending line makes with a horizontal plane.
Depression of the dewpoint — 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 — Same as Dip of the horizon, under Dip.