Sentence:  Using BLE, an airport or airline can define more targeted “<WSD>micro-locations</WSD>” to trigger an activity. The technology can be used with apps such as Passbook to display passenger itineraries, boarding passes, identification and notifications when passengers cross the geofence threshold of a defined location. 
Meaning of the word marked with <WSD> tags:  (countable) A specific location detected or targeted by micro-location technology.