Event; pageview, click, launch.
Any activity that takes place on an Internet-connected device can be defined as an event. This web-service securely tracks, monitors, and generate real-time analytical reports for any device connected to the Internet.
Opentracker defines an event as A decade ago we started measuring page-views generated by mouse-clicks. The definition of what we track has now expanded. We track a broader range of signals which we call events. Examples are a page-view, playing a movie, making a tweet, getting a download, or an ajax call. Other examples include the temperature measured by a sensor, a purchase at a grocery store or my heart rate while jogging.
WAA Definition: Any logged or recorded action that has a specific date and time assigned to it by either the browser or server.