| 富二代 | fù èr dài | children of entrepreneurs who became wealthy under Deng Xiaoping's economic reforms in the 1980s; see also 穷二代 |
| 小二 | xiǎo èr | waiter |
| 张二鸿 | Zhāng Èr hóng | Jung Chang 张戎 (1952-), British Chinese writer, author of Wild Swans 野天鹅 and Mao Zedong, the unknown story 毛澤東:毛泽东:鲜为人知的故事 |
| 心宿二 | Xīn xiù èr | Antares, the brightest star in Scorpio 天蝎座 |
| 心无二用 | xīn wú èr yòng | one cannot concentrate on two things at the same time |
| 数一数二 | shǔ yī shǔ èr | to enumerate; reckoned to be first or second best (idiom); one of the very best |
| 星期二 | xīng qī èr | Tuesday |
| 最小二乘 | zuì xiǎo èr chéng | least square (estimate) |
| 本周二 | běn zhōu èr | this Tuesday |
| 毫无二致 | háo wú èr zhì | there cannot be another one like it |
| 波粒二象性 | bō lì èr xiàng xìng | wave-particle duality in quantum mechanics |
| 激光二极管 | jī guāng èr jí guǎn | laser diode |
| 独二代 | dú èr dài | second generation only child |
| 甲二醇 | jiǎ èr chún | methylene glycol |
| 略知一二 | lüè zhī yī èr | slight knowledge of sth; to know very little about a subject; a smattering |
| 异戊二烯 | yì wù èr xī | isoprene |
| 发光二极管 | fā guāng èr jí guǎn | light-emitting diode; LED |
| 穷二代 | qióng èr dài | those who did not benefit from the Chinese economic reforms of the 1980s; see also 富二代 |
| 第二 | dì èr | second; number two; next |
| 第二位 | dì èr wèi | second place |
| 第二十 | dì èr shí | twentieth |
| 第二型糖尿病 | dì èr xíng táng niào bìng | Type 2 diabetes |
| 第二天 | dì èr tiān | next day; the morrow |
| 第二季度 | dì èr jì dù | second quarter (of financial year) |
| 第二次 | dì èr cì | the second time; second; number two |
| 第二产业 | dì èr chǎn yè | secondary sector of industry |
| 第二级 | dì èr jí | second level |
| 第二声 | dì èr shēng | second tone in Mandarin; rising tone |
| 第二轮 | dì èr lún | second round (of match, or election) |
| 第十二 | dì shí èr | twelfth |
| 约翰二书 | Yuē hàn èr shū | Second epistle of St John |
| 缠夹二先生 | chán jiā èr xiān sheng | annoying muddle-headed person who gabbles unintelligibly |
| 老二 | lǎo èr | the second child or brother (or sister); penis (slang) |
| 股二头肌 | gǔ èr tóu jī | biceps femoris (anatomy) |
| 肱二头肌 | gōng èr tóu jī | bicipital muscle; biceps |
| 臣一主二 | chén yī zhǔ èr | One has the right to choose the ruler one serves. (古谚 ancient proverb) |
| 茄二十八星瓢虫 | qié èr shí bā xīng piáo chóng | twenty eight spot lady beetle; Henosepilachna vigintioctopunctata Fabricius |
| 蒭藁增二 | chú gǎo zēng èr | same as 米拉, Mira (red giant star, Omicron Ceti), variable star with period of 330 days |
| 说一不二 | shuō yī bù èr | to say one and mean just that (idiom); to keep one's word |
| 周二 | zhōu èr | Tuesday |
| 黄花岗七十二烈士 | Huáng huā gāng qī shí èr liè shì | the seventy two martyrs of the Huanghuagang uprising of 23rd April 1911 |
| 黄道十二宫 | huáng dào shí èr gōng | the twelve equatorial constellations or signs of the zodiac in Western astronomy and astrology, namely: Aries 白羊, Taurus 金牛, Gemeni 双子, Cancer 巨蟹, Leo 狮子, Virgo 室女, Libra 天秤, Scorpio 天蝎, Sagittarius 人马, Capricorn 摩羯, Aquarius 宝瓶, Pisces 双鱼 |
