This is the 230th most frequent Persian word.
ریاست
"ریاست" means "leadership" or "presidency" in English.
The word "ریاست" here means 'presidency' or 'leadership', specifically indicating someone holding a leading position in an organization.
ریاست شرکت معتبر بر عهدهٔ او است.
The presidency of the reputable company is his responsibility.
In this sentence, "ریاست" refers to the concept or aspiration of leading or presiding.
او همیشه رؤیای ریاست را در ذهن خود داشت.
He always dreamed of presidency in his mind.
Here, "ریاست" indicates the act of leading or presiding over a meeting or session.