American Heritage Dictionary
(3)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
BeginInvoke ( "ManageUsers", New Object () {input}, callback, asyncState)— ASP.NET Forums
If a member function of an object is called as a callback, then the this does not refer to the object but the calling scope.— Dashboard RSS Feed
Delegate () method delegates a procedure to the click event as a callback, and then the procedure will be called if you click the button.— The Code Project Latest Articles
You specify a URL and a callback which is called with the HTTP response from the server.— Rick Strahl's Web Log
The XMLHttpRequest object calls the callback () function and processes the result— LXer Linux News

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