Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps

Verb: sign in
  1. Announce one's arrival, e.g. at hotels or airports
    - check in
  2. Enter a computer
    "Have you signed in lately?";
    - log in, log on, log-in

Derived forms: signed in, signing in, signs in

See also: sign

Type of: access, report

Encyclopedia: Sign in