n. an undiscussed imitation by a business of a competitor's action, such as changing prices up or down without the active conspiracy between business rivals, which would make this coincidental activity a violation of anti-trust laws. Example: a) Air Chance Airline offers a two-for-one special for all flights over 1,000 miles, and, within a week, several other airlines offer the same bargain. b) Rumble Oil Company stations set gasoline prices at $1.38 for premium and the next day all gas stations in the Rumble market area set their pumps at $1.38. Coincidence? No, conscious parallelism.