adv. Something that happens automatically, but that also has some mysterious, "magical" element to it. "Smart" appliances, features, etc. that do intelligent things with less help than you might expect.

Automatically, but in a way that, for some reason (typically because it is too complicated, or too ugly, or perhaps even too trivial), the speaker doesn't feel like explaining to you.

This term is quite old, going back at least to the mid-70s in jargon and probably much earlier. The word `automagic' occurred in advertising (for a shirt-ironing gadget) as far back as the late 1940s.

a process that happens automatically but cannot be explained to the processee how it actually happened.

Used to explain the unexplainable behavior of something. Usually refers to computers.

When doors open mysteriously or objects begin to work on their own.

something happening without doing something else to make it happen

Correction of my own entry below:

Pointless and pretentious word used to add no meaning at all to normal english sentences pertaining to the kind of automated proceedure computers were designed to do right from the very beginning of their invention. Almost every sentence in which this word appears can be improved upon by removing it.