subscriber

Etymology

subscribe + -er

noun

  1. A person who subscribes to a publication or a service.
    Our magazine has over ten thousand subscribers.
  2. (programming) A system or component that subscribes to something, such as an event, made available by a publisher.
    An event aggregator facilitates a fire-and-forget model of communication. The object triggering the event doesn't care if there are any subscribers. 2013, Addy Osmani, Developing Backbone.js Applications, page 175

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