|Origin:||prédécesseur, from Late Latin, from Latin decedere 'to go away, leave your job'|
someone who had your job before you started doing it [≠ successor]:
Kennedy's predecessor as president was the war hero Dwight Eisenhower.
a machine, system etc that existed before another one in a process of development [≠ successor]:
The new BMW has a more powerful engine than its predecessor.