/eks; ɛks/
n (infml 口) (pl ~es, ~'s) former wife or husband; former boyfriend or girlfriend 前妻或前夫; 以前的男朋友或女朋友
*My ex shares custody of the children. 我原先的配偶分担照顾孩子的责任.
* He is one of her many exes. 他是她以前众多的男友之一.

/eks; ɛks/
prep
1 (commerce 商) (of goods etc) as sold from (a ship, factory, etc) excluding cost of delivery to the buyer （指货物等）从（船上、工厂等处）交货（不包括运给买主的费用）
*ex warehouse price 仓库交货价.
2 excluding (sth); not included 除（某事物）外; 不包括; 不; 无; 未
*ex dividend, ie not including a dividend that is about to be paid 除去红利
* an ex-directory number 未列入电话簿的电话号码.

n [C usually singular]
[Date: 1800-1900; Origin: ex-]
informal someone's former wife, husband, girlfriend, or boyfriend
　I bumped into my ex in town.