N-COUNT (贴足邮票、写明姓名地址的)回邮信封 An s.a.e. is an envelope on which you have stuck a stamp and written your own name and address. You send it to an organization so that they can reply to you in it. s.a.e. is an abbreviation for 'stamped addressed envelope' or 'self addressed envelope'. (贴足邮票、写明姓名地址的)回邮信封 [British]