| 同仁县 | Tóng rén xiàn | Tongren county in Huangnan Tibetan autonomous prefecture 黄南藏族自治州, Qinghai |
| 同仇敌忾 | tóng chóu dí kài | anger against a common enemy (idiom); joined in opposition to the same adversary |
| 同位 | tóng wèi | par |
| 同位素分离 | tóng wèi sù fēn lí | isotopic separation |
| 同传耳麦 | tóng chuán ěr mài | simultaneous interpretation headset |
| 同侪 | tóng chái | peer; member of the same class, generation or social group |
| 同侪团体 | tóng chái tuán tǐ | peer group |
| 同侪压力 | tóng chái yā lì | peer pressure |
| 同侪审查 | tóng chái shěn chá | peer review |
| 同侪扶持 | tóng chái fú chí | peer support |
| 同侪检视 | tóng chái jiǎn shì | peer review |
| 同侪谘商 | tóng chái zī shāng | peer counseling |
| 同分异构体 | tóng fēn yì gòu tǐ | isomer |
| 同卵 | tóng luǎn | (of twins) identical; monozygotic |
| 同卵双胞胎 | tóng luǎn shuāng bāo tāi | identical twins |
| 同名同姓 | tóng míng tóng xìng | having same given name and family name |
| 同喜 | tóng xǐ | Thank you for your congratulations!; The same to you! (returning a compliment) |
| 同在 | tóng zài | to be with |
| 同型性 | tóng xíng xìng | isomorphism |
| 同型配子 | tóng xíng pèi zǐ | isogamete |
| 同堂 | tóng táng | to live under the same roof (of different generations) |
| 同字框 | tóng zì kuàng | name of radical in Chinese characters (Kangxi radical 13); see also 冂 |
| 同学们 | tóng xué men | classmates; fellow students |
| 同安 | Tóng ān | Tong'an district of Xiamen city 厦门市 (Amoy), Fujian |
| 同安区 | Tóng ān qū | Tong'an district of Xiamen city 厦门市 (Amoy), Fujian |
| 同安县 | Tóng ān xiàn | former Tong'an county, now Tong'an district 同安区 of Xiamen city, Fujian |
| 同室操戈 | tóng shì cāo gē | wielding the halberd within the household (idiom); internecine strife |
| 同工 | tóng gōng | fellow workers |
| 同床异梦 | tóng chuáng yì mèng | lit. to share the same bed with different dreams (idiom); ostensible partners with different agendas; strange bedfellows; marital dissension |
| 同德 | Tóng dé | Tongde county in Hainan Tibetan autonomous prefecture 海南藏族自治州, Qinghai |
| 同德县 | Tóng dé xiàn | Tongde county in Hainan Tibetan autonomous prefecture 海南藏族自治州, Qinghai |
| 同心县 | Tóng xīn xiàn | Tongxin county in Wuzhong 吴忠, Ningxia |
| 同性爱 | tóng xìng ài | homosexual |
| 同性恋 | tóng xìng liàn | homosexuality; gay person; gay love |
| 同性恋恐惧症 | tóng xìng liàn kǒng jù zhèng | homophobia |
| 同性恋者 | tóng xìng liàn zhě | homosexual; gay person |
| 同情者 | tóng qíng zhě | supporter; sympathizer (esp. of political cause); fellow traveler |
| 同态 | tóng tài | homomorphism (math.) |
| 同房 | tóng fáng | to cohabit (esp. to live as man and wife) |
| 同文馆 | Tóng wén guǎn | the first modern Chinese library established in 1898 by William A.P. Martin 丁韪良, becoming the foundation for Beijing University library |
| 同日 | tóng rì | same day; simultaneous |
| 同日而语 | tóng rì ér yǔ | lit. to speak of two things on the same day (idiom); to mention things on equal terms (often with negatives: you can't mention X at the same time as Y) |
| 同时代 | tóng shí dài | contemporary |
| 同时期 | tóng shí qī | at the same time; contemporary |
| 同案犯 | tóng àn fàn | accomplice |
| 同桌 | tóng zhuō | desk-mate; seat-mate |
| 同业 | tóng yè | same trade or business; person in the same trade or business |
| 同业拆借 | tóng yè chāi jiè | call loan; short term loan within banking |
| 同构 | tóng gòu | isomorphism; isomorphic |
| 同步加速器 | tóng bù jiā sù qì | synchrotron |
