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gloom. n. 1. partial or total darkness. 2. a state of depression or melancholy. 3. an appearance or expression of despondency or melancholy.. a. Partial or total darkness; dimness: switched on a table lamp to banish the gloom of a winter afternoon. b. A partially or totally dark place, area, or location. 2. a. An atmosphere of melancholy or depression: Gloom pervaded the office. b. A state of melancholy or depression; despondency.
Absence of light especially at night is the original meaning. Meaning gloomy, cheerless was also in O.E. Application to colors is 16c. Theater slang for closed is from 1916; darky, for black person is from 1775; In the dark ignorant first recorded 1670s.