Top definition
The Default and only Instant Messing or "IM" application ("app") shipped with the "Macintosh OSX" Operating system.
iChat can connect to ".Mac" - A serive offered by Apple, AOL's "AIM" and a few others.
There was a cloned version of iChat for Windows in the past, but from fear from Apple legal, it was pulled offline.
iChat, it's like AIM, but better...
by GrayApple May 14, 2006
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