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clearance ['klɪ(ə)rəns] abbr.
abbr., med. Cam amylase; C sstandard
avia., Canada An authorization issued by an ATC unit for an aircraft to proceed within controlled airspace in accordance with the conditions specified by that unit
mil., logist. Authorization given by name to certain officers and noncommissioned officers of traffic control units of acting on civilian traffic as to facilitate the movements of military vehicles. (FRA); A tactical task to remove all enemy forces from a specific location, area, or zone. 2. Elimination of signals on a radiotactical network so as to transmit on this network messages with higher priority. 3. The total elimination or neutralization of an obstacle that is usually performed by follow-on engineers and is not done under fire. (FRA)