(polite) first-person singular pronoun: I, me

a personal or private matter / (by extension) selfishness

a personal or private matter / selfishness / privacy, secrecy / (women's speech, obsolete) a brother-in-law

personal, private / secret

(formal) first-person singular pronoun: I, me

Alternative spelling of 私達 (“we; us”)

(mathematical analysis) Fourier transform

(Internet slang, humorous) I don't know why, but I can't convert it [this hiragana] into kanji [using my IME]

affine transformation

(computing) filesystem