返信へんしん Common Noun Irregular Transitive Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru transitive verb intransitive verb reply (e.g. email, fax, letter);answer これを受け取ったらすぐに返信してください。 Please send me a reply as soon as you receive this mail.