one-time

late, former, one-time, sometime

All these words are used occasionally (the first two a little more than that) to describe the earlier status of a person or thing. A late husband is one that is no longer alive, whereas a former husband (or ex-husband) is one that is no longer a husband (but is more likely than not still alive). Sometime is used more of the official function a person or thing has had, for example a building may be the sometime headquarters of the KGB; former and one-time are also possible here and would be more usual in everyday language. See also erstwhile; former, latter.