As they've recently released a new version of definition search (http://googlesystem.blogspot.com/2011/04/google-tests-search-option-for.html), the define: operator has stopped working on any Google versions (at least from France).

A search for [define:apple] now return:
> No definitions were found for apple.
>
> Suggestions:
> – Make sure all words are spelled correctly.
> – Search the Web for documents that contain "apple"

I don't get why they don't show the same SERP as [define apple], or even better, the results with the new "dictionnary filer" (available in the more search tools menu).

Same problem in South Africa over the past week