I have used the word "invite" as a noun and have been corrected by a friend. Â She encouraged me to use the word "invitation." This is obviously correct. Is using the word "invite" as a noun completely incorrect? Â Is there some gray area? Â
This use is growing more and more common and more and more accepted. See another discussion here:
invite vs. invitation
In all formal settings, I would still use invitation. I might make an exception when talking about electronic forms of invitation.