When I was a kid, I learned that you invite people to a party by sending "invitations".

Sometime in the past 20 years (I think) that changed. Now you probably send "invites", with the stress on the first syllable.

Listening to my daughter playing online with a friend yesterday, I heard the word come full circle. Now "invite", still with the stress on the first syllable, has become a verb again, meaning "to send an invite". I wonder if that change will stick.

Another usage I've heard from my daughter - instead of "by accident", she describes things as happening "on accident" - presumably in contrast to "on purpose". Is that just her, or is it more widespread?