This is the 720th most frequent German word.
ehemalige
"Former" or "ex-".
'Ehemalige' is used as part of 'ehemaliger Studenten', signifying that they were students in the past.
Er traf sich mit einer Gruppe ehemaliger Studenten, um Erinnerungen auszutauschen.
He met with a group of former students to share memories.
'Ehemalige' here modifies 'Lehrer', indicating that the person was a teacher in the past.
Der ehemalige Lehrer besuchte die Schule, um an einem Treffen teilzunehmen.
The former teacher visited the school to attend a meeting.
'Ehemalige' is used to describe 'Fabrik', showing that the building is no longer a factory.