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What does sign on mean?

Looking for the meaning or definition of the word sign on? Here's what it means.

Noun
  1. (broadcasting) The time of day when a radio or television station begins broadcasting, usually after being off the air for several hours.
  2. Alternative form of sign-on
Verb
  1. To join something, after signing.
  2. To commit oneself, as to a project, a goal, on organization, a cause.
  3. (broadcasting) To begin broadcasting a radio or television signal, usually at the beginning of a broadcasting day and after being off the air for several hours.
  4. (idiomatic) To log on; to start using a computer, radio, etc., or to start talking.
  5. (Britain, intransitive) To apply to receive unemployment benefits.
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