twi·light zone • n. 1. a conceptual area that is undefined or intermediate: the twilight zone between the middle and working classes. ∎ a sphere of experience that appears sinister or dangerous because of its uncertainty, unpredictability, or ambiguity: schizophrenia isolates the individual in a twilight zone of terror. 2. the lowest level of the ocean to which light can penetrate.
"twilight zone." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (January 17, 2019). https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/twilight-zone
"twilight zone." The Oxford Pocket Dictionary of Current English. . Retrieved January 17, 2019 from Encyclopedia.com: https://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/twilight-zone