This is the 128th most frequent Russian word.
президент
The head of state or leader of a republic.
In this sentence, 'президент' is used in its primary meaning to denote the head of state, performing an official act.
Президент подписал новый закон.
The president signed a new law.
Here, 'президент' refers to the leader of an organization or group, showcasing a non-political usage.
Он был президентом клуба в прошлом году.
He was the president of the club last year.
In this context, 'президент' is used in the corporate sense, indicating the leader of a business entity.