Maybe google this one? You would probably get better answers
Extending in scope or effect to a prior time or to conditions that existed or originated in the past; especially : made effective as of a date prior to enactment, promulgation, or imposition
B.
How could you find something if you don't know what you're looking for?
Journal writings are an effective tool for developing new essay topics.
Kahi jeeb llakeee back he. a a e jjnj vfbea naj