Sentence:  The <WSD>micro-location</WSD> capabilities of beacons enable retailers to interact directly with their clients. For instance, in 2014, Safeway and Giant Eagle deployed beacons in nearly 200 grocery stores across the US. These beacons communicate with the supporting apps and send relevant pop-up notifications to people as they pass through the shop. 
Meaning of the word marked with <WSD> tags:  (uncountable) The process of electronically determining the location of something with a level of precision that locates it within a building or room.