Qui doesn't exist in English other than as a slightly shorter version of the prefix "equi-." This version of the qui definition is "equal." All other words with "equi-" as a prefix also apply, such as "equidistant," "equiformal," and "equiangular." As with many prefixes of this type, like "anti-," a hyphen is not required if the meaning is, or is similar to, "something that is equal to something else." Other similar qui meanings using the "equi-" prefix include "equivalent," "equilibrium," and "equilateral." The words are useful in philosophy, mathematics, and medicine. "Equanimity" is a synonym for "equilibrium" when it comes to mental focus and calm.
a general stampede, panic, or disorder.