This is the 5268th most frequent Russian word.
обязанность
"Обязанность" means "duty" or "obligation."
обязанность, conveying the meaning of a duty or responsibility that is expected by a societal or legal standard.
У каждого гражданина есть обязанность соблюдать законы страны.
Every citizen has the duty to abide by the laws of the country.
обязанностью, used to denote a designated or allocated responsibility in a professional or task-oriented context.
Её обязанностью было следить за порядком в офисе.
Her responsibility was to maintain order in the office.
обязанностью, expressing a self-imposed or morally perceived obligation or duty.