noun

• (computing) The ability of one system or part of a program to send notifications to another, by raising events.
  "The concept behind eventing is fairly simple. With eventing, you have two pieces of code. For example, you might have a script that is running based on a scheduled task. That script might encounter some condition and can raise (or signal) an event, perhaps that it has completed its work. A second bit of code, perhaps a second script running on that same system, can register for events."
• (social sciences, rare) The occurrence of an event.
  "The corollary of this, as Whorf points out, is that thinkings and feelings to do with 'eventings' in the world are located there, out in the world in which the eventing takes place - as a natural part of the whole into which they are interwoven."

verb

• (obsolete) present participle and gerund of event