noun
spontaneity; voluntary action
General noun for acting on one's own initiative, without external prompting. Often used in compounds like 自発的 (spontaneous) and 自発性 (spontaneity).
See also: 自発的
彼の自発的な行動が評価された。
His spontaneous action was appreciated.
自発的に手伝ってくれてありがとう。
Thank you for helping voluntarily.
noun
spontaneous passive
Linguistics term for a passive-like construction that implies something happens spontaneously or without an explicit agent. Common in Japanese grammar descriptions.
日本語の「自発」は、動詞の未然形に「れる・られる」を付けて表す。
In Japanese, the spontaneous passive is expressed by attaching 'reru/rareru' to the irrealis form of a verb.