Dictionary.net

• light on an airplane that indicates the plane's position and orientation; red light on the left (port) wing tip and green light on the right (starboard) wing tip

2006 - WordNet 3.0
By Princeton University

• light on an airplane that indicates the plane's position and orientation; red light on the left (port) wing tip and green light on the right (starboard) wing tip

2011 - English Dictionary Database
By DataStellar Co., Ltd