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Someone told me that the verb sign up isn't used to mean class registration. Instead, I should use to enroll.

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You were told wrong. – Barrie England Jun 25 '12 at 18:11
There's a subtle difference. It kind of depends. – simchona Jun 25 '12 at 18:18
Enroll is probably a more formal way to say it, but that doesn't mean sign up is "wrong". – J.R. Jun 25 '12 at 18:21
If you want to speak formally, you should use "enroll" rather than "sign up", which is in a less formal register. So if you're writing an official document, don't use "sign up" for class registration. – Peter Shor Jun 25 '12 at 18:21
up vote 1 down vote accepted

Sign up: the action of enrolling for something or of enrolling or employing someone.

  • A sign-up fee of £29.95.
  • He signed up 50 employees this year alone.
  • The signing up process is too long.

If you Google search for the definition of sign up, you would find similar meanings. So, there is not much difference between the two (sing up and enroll).

Plus, as others have already pointed out, enroll is more formal than sign up.

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