This is the 708th most frequent Persian word.
امیر
"Amir" (امیر) means "prince" or "commander."
In this sentence, 'امیر' is a proper noun and refers to a person's name.
امیر به کتابخانه رفت.
Amir went to the library.
Here, 'امیر' is used as a title meaning 'Commander' or 'Leader'.
امیر سوار بر اسب به میدان آمد.
The emir rode his horse into the field.
In this example, 'امیران' (plural of 'امیر') refers to historical figures with the title 'Emir'.