What is the meaning of the word redundancy?

Looking for the meaning or definition of the word redundancy? Here are some definitions.
Meanings & Definitions
  1. the state of being not or no longer needed or useful
  2. words data that could omitted without loss meaning function; repetition superfluity information
  3. inclusion extra components that strictly necessary functioning, case failure other components
  4. state being longer employed because there more work available
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