veteran
/ˈvetərən/noun
1- a person who has had long experience in a particular field, especially military service老手 （尤指老兵、老战士）：
a veteran of two world wars.
经历过两次世界大战的老兵。
1.1
- an ex-serviceman or -servicewoman退伍军人。
词源
early 16th cent.: from French vétéran or Latin veteranus, from vetus 'old'.