This is the 4874th most frequent Polish word.
oznajmił
"Declared" or "announced."
The word 'oznajmił' here is used to indicate an official or formal announcement some occurrence.
On ostatecznie oznajmił swoje przybycie.
He ultimately announced his arrival.
In this usage, 'oznajmił' reflects the act of informing or clarifying information to a group or individual.
Dyrektor oznajmił plan na nowy projekt.
The director announced the plan for the new project.
In this sentence, 'oznajmił' represents the act of sharing a personal achievement or event.