This is the 634th most frequent German word.
mitteilung
"Mitteilung" means "message" or "communication" in English.
In this sentence, 'Mitteilung' refers to a piece of information or a message delivered to someone.
Er hat die Mitteilung erhalten und sofort darauf reagiert.
He received the message and responded immediately.
'Mitteilung' is used here to specify a formal or official note of communication requested in writing.
Bitte senden Sie mir eine schriftliche Mitteilung.
Please send me a written notification.
Here, 'Mitteilung' is used to denote a formal announcement or communication provided by an official entity, in this case, the school.