姉

Formal or literary term

older brother and older sister

one's sister-in-law; stepsister (elder)

はいとこ is Tohoku dialect

second cousin

eldest sister; oldest sister

biological older sister; real elder sister

Buddhism

Sister (i.e. a nun; sometimes used as a posthumous suffix)

又従兄 and 又従弟 are abbr.

second cousin

Linguistics

sociolect emphasizing the femininity of the speaker (esp. used by homosexual men)

foster sister

Humble

older sister

sisters; female siblings

Bengalese finch; society finch (Lonchura striata var. domestica)

Slang

women who have had sex with the same man; pole sisters

one's next oldest sister; second elder sister

Slang

celebrity or comedian (usu. male) taking on an effeminate role (through mannerisms, way of speaking, etc.)

half-sister (different father); half-sisters

your elder sister

Honorific

your older sister

Primarily used by men in letters to older women

you

Referring affectionately to close acquaintances

ladies and gentlemen

sisters of the same mother; uterine sisters

Abbreviation

fashion style characterized by brown hair and deep-tanned skin, expensive brand-name clothes and accessories

Slang

pogo sisters; women who have had sex with the same man

Colloquial

sitting on the floor with one's legs tucked under to one side

step-sister (elder); stepsister