Definitions

1. adjective

belonging to a past time or era; previous or preceding

“She was a former student of the university.”

2. noun

a person or thing that was previously in a particular position or role; a past occupant or holder

“The former mayor is now running for office again.”

3. adverb

formerly; in the past

“He used to live in New York, but he is now living in California, former resident, that is.”