历届
lì jiè · HSK 7
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📅 历 = successive/past + 届 = a session or term, so 历届 = every past session
历 carries the sense of one-after-another (as in 历史 history); 届 counts sessions, terms, or graduating classes. Together they mean all the previous ones in a series, like every past Olympic Games or graduating class.
届 — corpse radical 尸 + 由
届 originally combined 尸 (a bent body) with a phonetic element, depicting someone arriving at a destination. Over time it came to mean 'to reach,' 'arrive at,' or 'fall due,' and is now used for sessions or terms (e.g., a graduating class) that arrive on schedule.