自し然ぜん放ほう出しゅつMeaningsNoun1. spontaneous emissionKanji used自self然sort of thing放release出exitComposed of自し然ぜんnature; natural; spontaneous; automatic; naturally; spontaneously; automaticallyNoun放ほう出しゅつemission; release; radiation; discharge; gush; release (of goods, a player from a team, etc.)Noun