Question

what is the full form of PM?​

Answer 1

AM: Anti Meridiem, PM: Post Meridiem. AM and PM both are Latin words, used in 12-hour clock system to represent Before Noon and After Noon respectively. They are also represented as A.M. and P.M. AM expand as Anti Meridiem which means "before midday" and PM expand as Post Meridiem which means "after midday.
or
prime minister

Answer 2

Prime minister is the full form of PM