Former definition, preceding in time prior or earlier during a former stage in the proceedings.
Former you use former in front of a noun to indicate that the person you are talking about is no longer the thing referred to by the noun. For example, the former chairman of a company used to be the chairman, but is not the chairman now.
Former definition and meaning | Collins English Dictionary
former definition former is used to describe someone who used to have a particular job , position, or role.
Euro rscg arks has lost several major accounts and shrunk to a third of its former size in the past two years. In a nod to the countys former hippy past, the companys head chef is said to have formerly worked for the rock band grateful dead.