This is the 1146th most frequent Russian word.
премьер
"Premier" in English means "prime minister" or "leader of a government."
In this sentence, 'премьер' as part of 'премьер-министр' refers to a political leader or head of government.
Премьер-министр выступил с речью.
The Prime Minister gave a speech.
Here, 'премьерный' relates to being the first showing of a performance or event.
В театре состоится премьерный показ новой пьесы.
The theater will host the premiere of a new play.
Similarly to the previous example, 'премьерных' here highlights the first showing or debut of films in the season.