de facto
noun /ˌdeɪ ˈfæktəʊ/
  /ˌdeɪ ˈfæktəʊ/
(plural de factos)
 (Australian English, New Zealand English)- a person who lives with somebody as their husband or wife, although they are not officially married事实事实:尽管未正式结婚但仍与某人作为丈夫或妻子生活的人 - We've invited James and his de facto to our wedding.我们邀请了詹姆斯和他的未婚妻参加我们的婚礼。 
 词源Latin, literally ‘of fact’.
- We've invited James and his de facto to our wedding.