- 十一月 Shíyīyuè Novemberthe eleventh month of the Gregorian calendar
- 十一点 shíyīdiǎn eleven o'clockeleven o'clock (abbreviated from [[十一|十一|shi2 yi1]][[点钟|點鐘|dian3 zhong1]])
- 十一月份 shíyīyuèfèn November
- 二十一 èrshíyī twenty-onethe number 21
- 不管三七二十一 bùguǎnsānqī'èrshíyī blindlyacting recklessly or impulsively based on a simplistic or hopelessly optimistic assumption
- 二十一点 èrshíyīdiǎn blackjackthe card game blackjack
- 三七二十一 sānqī'èrshíyī factsthe facts of the matter or the actual situation
- 三十一 sānshíyī thirty-onethe cardinal number 31
- 第四十一 dìsìshíyī forty-firstthe ordinal number forty-first
- 八十一 bāshíyī eighty-onethe number eighty-one
- 十一点钟 shíyīdiǎnzhōng eleven o'clockthe hour of eleven, or a direction relative to a clock face used for navigation.
- 十一路 shíyīlù walking(coll.) going on foot
- 管他三七二十一 guǎntāsānqī'èrshíyī regardlessacting impulsively or without considering the consequences; no matter what
- 黄帝八十一难经 Huángdì Bāshíyī Nànjīng Classic of DifficultiesThe Yellow Emperor's Classic of Eighty-one Difficulties, a foundational Chinese medical text dating from approximately the 1st century AD
- 二十一条 èrshíyī Tiáo Twenty-One Demandsthe Japanese Twenty-One Demands of 1915
- 二十一世纪 èrshíyīshìjì 21st century
