the Japanese word for "older brother" (younger brother is itouto).
Kiyoshi is my oniichan, Wakana is my oneechan.
by MishaMassacre August 15, 2007
Top Definition
Onee-chan is Japanese for older brother.

"Good morning, Onii-chan"
by Odelia November 04, 2007
TLDR: Older Brother

A little more detail if you like-
Onii can end with 3 different Japanese honourifics, -San, -Chan, or -Sama.
-San is the basic ending for the basic big bro.
-Chan is a more compassionate ending for Onii if you really love your big brother and feel emotionally attached to him greatly
-Sama is a bit of a formal ending for big brother, nothing too special.
My Onii-San is a cool bro
I really love my Onii-Chan!
Yes he is my Onii-Sama
by Rywen March 10, 2015
A strikingly sexy male friend, who all girls fawn over. A word used in replacement for the male friend's name whom you drool over so dearly. In Japanese, Onii-chan means older brother, and is a title of respect and in some cases, resentment. Onii-chan is a word commonly used during weaboos climaxing over hot characters in their favourite anime
Hands off! Lincoln is my Onii-chan!
by Lord Onii March 10, 2015
Means sister or brother.
Kotomi: Nuu Onii-Chan
by corakc November 11, 2009

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