Other forms: notifications
A notification is a formal notice, request, or warning. You might get a notification from your landlord that you need to shovel the snow on your sidewalk, or a notification from your school that you've won an award.
Some notifications arrive in the form of a letter in your mailbox, while others are verbal (you might get a phone call that's a notification that your cat is due for a shot at the vet), and many more are sent as emails or other electronic messages. The Latin source is notificare , "to make known," which comes from the roots notus, "known," and facere, "make."