Definitions for "AIRPROX"
(Aircraft Proximity) A situation in which the separation minima required between in-flight aircraft for safe operations is not respected. (– ATIR)
a situation in which, in the opinion of a pilot or a controller, the distance between aircraft as well as their relative positions and speed have been such that the safety of the aircraft involved was or may have been compromised
an incident in which two or more airplanes flew closer to each other than the legally required horizontal and vertical separation