a. The act of depressing.
b. The condition of being depressed.
2. An area that is sunk below its surroundings; a hollow.
3. The condition of feeling sad or despondent.
4. A mood disorder characterized by persistent sadness or inability to experience pleasure combined with other symptoms including poor concentration, indecisiveness, sleep problems, changes in appetite, and feelings of guilt, helplessness, and hopelessness. Also called clinical depression, major depressive disorder.
5. A lowering or reduction, as:
a. A reduction in physiological vigor or activity: a depression in respiration.
b. A lowering in amount, degree, or position: depression of stock prices.
a. A period of drastic economic decline, characterized by decreasing aggregate output, falling prices, and rising unemployment.
b. A period of widespread poverty and high unemployment.
c. Depression See Great Depression.
7. Meteorology A region of low barometric pressure.
8. The angular distance below the horizontal plane through the point of observation.
9. Astronomy The angular distance of a celestial body below the horizon.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.