NMAC (Near Mid-Air Collision) Defined by FAA as a potential collision situation between aircraft within 500 feet of each other.
NEAR MIDAIR COLLISION (NMAC)
An incident associated with the operation of an aircraft in which the possibility of a collision occurs as a result of proximity of less than 500 feet...
Midair Collision MAC - Near Midair Collisions NMAC - Top 7 Reasons why midair collisions occur
Minimum descent altitude (MDA)
Minimum obstruction clearance altitude (MOCA) ...
 See also: Airport, Transport, Collision, Dynamic, Air traffic
  
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