The Seiyuu reference article from the English Wikipedia on 24-Apr-2004
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Seiyuu

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Seiyuu (声優) is a Japanese term that roughly equates to a voice actor/actress for both radio and television. On television, they are mostly used in anime and commercial advertisements.

Typical American fan convention is specifically only call *Japanese* dialogue actors seiyuu.

Notable seiyuu include: (Japanese version unless noted)