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1.
(ə-ˌlü-mə-ˈnä-tē)

-n pl

Elite members of society who belong to a conspiratorial organization which attempts to control world affairs. A central tenet of the group is a belief that aliens and/or governmental organizations want to read their minds or control them using electromagnetic "brain-rays," and that such attempts are blocked by covering one's head with aluminum foil.
Why didn't the doctor let us talk about UFOs until we put on tin foil hats? He's one of the Aluminati.
by Smart as Shat September 02, 2010