Any Friday on which a public disaster has occurred, as: In England, December 6, 1745, when the news of the landing of the Pretender reached London or May 11, 1866, when a financial panic commenced. In the United States, September 24, 1869, and September 18, 1873, on which financial panics began.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). black friday. Retrieved September 21, 2026, from http://smartdefine.org/black_friday/definitions/1980699 |
| Chicago | Webster's. 2011. "black friday" http://smartdefine.org/black_friday/definitions/1980699 (accessed September 21, 2026). |
| Harvard | Webster's 2011, black friday, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/black_friday/definitions/1980699>. |
| MLA | Webster's. "black friday" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/black_friday/definitions/1980699> |