旬，十日也，三旬為一月。
夏朝已有是名矣。甲骨文有旬。中國古代，以天干紀日。以太陰圓缺之週期，定「月」之修短[一]，每及十日，周而復始，故名之旬。一月之中，初十日为上旬，次者中旬，餘者下旬。
旬亦指年齡，十歲爲一旬。若白居易《偶吟自慰兼呈夢得予與夢得甲子同，今俱七》詩：「且喜同年满七旬。」於是引申矣。旬年爲十年，八旬老翁爲八十歲老人云。
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