届期 (jiè qī) is a formal noun meaning 'term of office' or 'duration of a session', commonly used in political, academic, or organizational contexts. The character 届 (jiè) denotes a 'session', 'term', or 'edition'—as in the term of a government body or the graduation year of a class—while 期 (qī) means 'period', 'term', or 'duration'. Together, they emphasize the fixed, institutional timeframe during which a person holds office or an official body remains in session.

This word appears frequently in official documents, news reports, and announcements—for example, when referring to the end or beginning of a legislative term, university academic year, or committee mandate. It carries a formal, written register and is rarely used in casual speech. Unlike more general terms like 时间 (shíjiān, 'time') or 期间 (qījiān, 'during'), 届期 specifically connotes an officially designated, bounded interval tied to roles, elections, or institutional cycles.