
ehemalig
former
Indicates that someone or something previously had a particular quality, position, or function, but no longer has it now.
Der ehemalige Präsident besuchte seine alte Schule.
The former president visited his old school.
former
Loading your saved state.

former
Indicates that someone or something previously had a particular quality, position, or function, but no longer has it now.
Der ehemalige Präsident besuchte seine alte Schule.
The former president visited his old school.
The word is derived from 'ehemals' (formerly), which means 'früher' (earlier / formerly). It is related to 'ehe' (before) and 'Mal' (point in time) and describes a state that applied at an earlier time.
Das Gebäude war ehemals eine Schule, heute sind dort Wohnungen.
The building was formerly a school; today there are apartments there.
'Ehemalig' (former) is used almost exclusively attributively, meaning directly before a noun. You cannot say: 'Das Gebäude ist ehemalig.' (The building is former.)
Das ist der ehemalige Bahnhof der Stadt.
That is the city's former train station.
The adjective is very often used in connection with professions, titles, relationships, or the former function of places and buildings.
Der ehemalige Profisportler arbeitet jetzt als Trainer.
The former professional athlete now works as a coach.
old
When used for a person, “alt” can express a former relationship, but without clear context it is ambiguous and can also refer to age. “Ehemalig” clearly means that the stated relationship or position no longer exists.

Bei der Feier sprach ich lange mit meinem ehemaligen Chef.
At the celebration, I talked at length with my former boss.
Bei der Feier sprach ich lange mit meinem alten Chef.
At the celebration, I talked at length with my old boss.