excited (adj.)youdaoicibaDictYouDict
1650s, "magnetically or electrically stimulated;" modern sense of "agitated" attested 1855; past participle adjective from excite. Related: Excitedly.
laser (n.)youdaoicibaDictYouDict
1960, acronym for "light amplification by stimulated emission of radiation," on pattern of 1955 MASER. A corresponding verb, lase, was coined 1962.
maser (n.)youdaoicibaDictYouDict
1955, acronym from "microwave amplification (by) stimulated emission (of) radiation."
stimulate (v.)youdaoicibaDictYouDict
1610s, "rouse to action," from Latin stimulatus, past participle of stimulare (see stimulation). Related: Stimulated; stimulating.