This is the 602nd most frequent Persian word.
سید
The Persian word "سید" (Seyyed) refers to a descendant of the Islamic Prophet Muhammad, often through his grandsons Hasan and Husayn.
In this sentence, 'سید' is used as a title of respect often denoting lineage to the Prophet Muhammad.
سید احمد فرد نجیبی است که به همه کمک میکند.
Sayyed Ahmad is a kind person who helps everyone.
'سید' here is utilized as a formal address for a respected individual.
در مجلس دیروز، همگی از اندرهنمودهای جناب سید بهره بردند.
In yesterday's assembly, everyone benefited from the insights of Mr. Sayyed.
In this context, 'سید' is part of a proper noun representing a character's name.