This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. the kinship relation between a female offspring and the siblings

n. an association or society of women who are linked together by a common religion or trade or interest

"NASA hopes it won't need it, but just in case the shuttle Atlantis/Hubble Space Telescope servicing crew needs a rescue sistership Endeavour will be ready to serve."

relationship    family relationship    kinship    association   

mastership    sisters    starship