Meaning : A piece of work that exploits or builds on earlier work.
Example :
His new software is a follow-up to the programs they started with.
Synonyms : followup
Meaning : An activity that continues something that has already begun or that repeats something that has already been done.
Synonyms : followup
Meaning : A subsequent examination of a patient for the purpose of monitoring earlier treatment.
Synonyms : followup, reexamination, review