personal, private / secret

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

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

a personal or private matter / (by extension) selfishness

private; mine

Alternative spelling of 私達 (“we; us”)

chord progression

(physics) travelling wave (wave that is not bounded by a given space, but can propagate freely)

everything

(colloquial) current boyfriend