With respect to the operation of aircraft, means the height at which a decision must be made, during an Instrument Landing System (ILS) or Precision Approach Radar (PAR) instrument approach, to either continue the approach or to execute a missed approach. (14CFR1)

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A height above the highest elevation in the touchdown zone, specified for a glide slope approach, at which a missed-approach procedure must be initiated if the required visual reference has not been established. See also decision altitude. 1/6/78

Hauteur au-dessus du point le plus élevé de la zone de posé, spécifiée pour une approche de précision, à laquelle une procédure d'approche manquée doit être amorcée si le contact visuel nécessaire n'a pas été établi. Voir aussi altitude de décision. 1/6/78

With respect to the operation of aircraft, means the height at which a decision must be made during an ILS, MLS, or PAR instrument approach to either continue the approach or to execute a missed approach.
(See ICAO term DECISION ALTITUDE/DECISION HEIGHT.)