I am not the sort of person who receives an inordinate number of invitations, likely due in no small part to my propensity to swing conversational topics away from things like popular movies or good books and over to the specifics of the language by which one talks about such things. As such, it is not in the cards for me to be picky about the tenor of an invitation. I never understood the people who refuse to go to a party because they were invited at the last minute. My response is always, “I’ll be ready in three minutes, thanks thanks thanks.” This may be because I was — and this may surprise some of you — not one of the popular kids in high school.
Okay, actually, I’m lying. In truth, I am picky about the invitations I accept, just because many of the things that my friends enjoy doing hold no inducement for me. Bars, dancing, sunny day beach trips, all not my cup of tea. Unless there’s cheap food or a thrift store involved, I’m out. But when I reject an invitation, I always have a valid reason: it sounds boring. Some other people do not; instead they complain about the fact that they have not been given an invitation, but rather an invite. This is because those people assume invite is either just a recent truncation of the full and more proper invitation, or the recent co-opting of the verb invite into a noun. In either case, it’s unacceptable. As Eric Partridge writes in Usage and Abusage:
“invite for (an) invitation is incorrect and ill-bred and far too common”
A sharp dismissal. Except, wait, what the hell does it mean for a word to be “ill-bred”? The only meaning I can come up with is that the word was formed through improper means. But that’s patently false, as nominal invite comes from verbal invite by the same means as some uncontroversial nouns like command and request, both of which started life as verbs according to the MWDEU. In fact, this method (zero-affixation) of forming nouns from verbs used to be quite commonplace. Arnold Zwicky has found that nominal request took the place of nominal ask, which first showed up a millennium ago. Adam Albright found the following words in the OED as nouns:
adorn, disturb, arrive, destroy, relate, pray, recede, announce, ask, think, amaze, depart, reduce, produce, maintain, retain, detain, deploy, retire, acquit, greet, defend, divulge, startle, entertain, vanish
The attestations of these are all in the past; it’s likely few people would consider all (or even many) of these valid nouns nowadays. But I think it gives some evidence that invite isn’t ill-bred; it’s attested back to the 1600s in the OED, and it was formed by what used to be a pretty productive rule. So it’s not incorrect, it’s not ill-bred, and since neither of the first two hold, there’s no reason to complain about its commonness. Sorry Eric Partridge, but zero-for-three.
Now, there does seem to be some truth to the claim that invite is less formal than invitation; the MWDEU’s historical examples of nominal invite are often from the mouths of lower-class characters or light writing. But being informal is not the same as being bad grammar, no matter how badly the prescriptivists want that to be the case.
Summary: Nominal invite, as in I got an invite, isn’t a recent piece of bad grammar. It’s been attested since the 17th century and it came from a previously common grammatical rule. At worst, it’s informal. I’d use invitation if you don’t feel like a fight, but when you’re in a bad mood, use nominal invite and tear into anyone who dares object.