1. A person who performs labor for his living, especially manual labor.
  2. A nonreproductive social insect, such as ant, bee, termite or wasp.
    1. (rare): A female ant, bee, termite or wasp.
  3. A thread performing one instance of a particular task within a program.
    This FTP client spawns a separate worker for each file to be uploaded.

The above text is a snippet from Wiktionary: worker
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