use, usage

Short for 省エネルギー (shō-enerugī, “energy conservation; energy-saving”).

incandescent light bulb

use, utilize

(chiefly women's speech) first person singular pronoun: I, me

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

a personal or private matter / (by extension) selfishness

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

personal, private / secret

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