1 definition by BookLover99

A person with whom you either share parents, church, or EXTREME love, understanding, and comprehension.
My sister is my best friend. I would protect her with all my skill, and even my life if necessary.

My sister is 67. I'm only 19. This is the best type of sisterly relationship ever!

Aletha Freeman-Black and Danger Granger-Lupin are sisters in every way that matters.

My sister and I share a religion and a brain type. Are we clinically insane? no. Are our IQs below 70? Certainly not.
by BookLover99 March 23, 2010
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