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”)

a visit by a student's guardians to observe the class

in class

calculus (differential calculus and integral calculus considered as a single subject)

(calculus) an indefinite integral, antiderivative

(calculus) definite integral