The I797 is a form that is used by the United States Citizenship and Immigration Services. The form is used to show approval of immigrant visa petitions.
US Immigration http://uscis.gov/graphics/index.htm
EN approval stands for Elf Nation.
ratify
A word that means to give official approval to is to ratify.
Conditional approval most likely means approval pending checking the facts listed in the application, or approval with certain restrictions.
Ex-ost-facto means the rules applicable at the time of before the happenings for which which approval sought and post-facto means the rules applicable at the time after the happenings for which the approval is sought.
Praise
"Endorsement" is an 8-letter word that means official approval or support.
One who claps hands as a greeting, encouragement, expression of admiration, or approval.
It means "yes."
veto