a person or thing that works.
a laborer or employee: steel workers.
a person engaged in a particular field, activity, or cause: a worker in psychological research; a worker for the Republican Party.
a member of a caste of sexually underdeveloped, nonreproductive bees, specialized to collect food and maintain the hive. See illus. under bee.
a similar member of a specialized caste of ants, termites, or wasps.
Printing. one of a set of electrotyped plates used to print from (contrasted with molder ).
any of several rollers covered with card clothing that work in combination with the stripper rollers and the cylinder in the carding of fibers.

1300–50; Middle English werker, worcher. See work, -er1

nonworker, noun
subworker, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
worker (ˈwɜːkə)
1.  a person or thing that works, usually at a specific job: a good worker; a research worker
2.  an employee in an organization, as opposed to an employer or manager
3.  a manual labourer or other employee working in a manufacturing or other industry
4.  any other member of the working class
5.  a sterile female member of a colony of bees, ants, or wasps that forages for food, cares for the larvae, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Suddenly, a paint-splattered worker picking at a nearby wall shouts, waves his
  steel trowel and points.
Then the health worker, or even the patient, can take a picture of the stamp
  with a cellphone.
Worker animals dig the burrows that the whole clan inhabits, using their
  prominent teeth and snouts.
Beekeepers would lift the lid of a hive to find only the queen and a few
  stragglers, the worker bees gone.
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