This is one of the pages of the sci.lang.japan Frequently Asked Questions.
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>> 7. Word meanings
7.1. What is an otaku?
Otaku is a polite word that means "you" (see also 10.1. What are the personal pronouns of Japanese? ) or "your household" or "your house". Taku means
"residence" or "home" and the o- in front of the word makes it more
polite. Because of the respect implied the meaning becomes "your
home". Serious anime (Japanese animated film) fans and
computer geeks started calling each other otaku, which is not
terribly weird, since it does mean "you", but normally people would
move to less formal words once they get to know each other. From
this, people outside the anime world began to use
otaku-zoku (roughly, "the otaku people" or "groups
that say otaku"), and it has now come to mean "somebody that
gets fanatical about their hobby" when used in such a context. From
this usage, American anime fans have taken to using the word
otaku to mean "anime fan", without, necessarily, the
pejorative overtones associated with the word in Japanese.
Edited from a post by David Luke.
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