This is the 190th most frequent Chinese word.
主席
Chairperson; chairman; president.
Here, "主席" refers to the individual chairing or leading the meeting, emphasizing their leading role.
主席正在主持会议。
The chairman is presiding over the meeting.
In this sentence, "主席" denotes the elected or appointed leader of an organized group, such as a club or association.
她是我们俱乐部的主席。
She is the president of our club.
Here, "主席" is used as the title for a national leader, reflecting a formal government role.