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1.
Onee-chan is Japanese for older brother.

"Good morning, Onii-chan"
by Odelia November 04, 2007
 
2.
the Japanese word for "older brother" (younger brother is itouto).
Kiyoshi is my oniichan, Wakana is my oneechan.
by MishaMassacre August 15, 2007
 
3.
Means sister or brother.
Kotomi: Nuu Onii-Chan
by corakc November 11, 2009