| 同源 | tóng yuán | homology (biology); a common origin |
| 伙同 | huǒ tóng | to collude; in collusion with |
| 放射性同位素 | fàng shè xìng tóng wèi sù | radioactive isotope; radioisotope |
| 同伙 | tóng huǒ | colleague; co-conspirator; accomplice |
| 与此同时 | yǔ cǐ tóng shí | at the same time; meanwhile |
| 同心协力 | tóng xīn xié lì | to work with a common purpose (idiom); to make concerted efforts; to pull together; to work as one |
| 共同纲领 | gòng tóng gāng lǐng | common program; formal program of the communist party after 1949, that served as interim national plan |
| 同化作用 | tóng huà zuò yòng | assimilation; anabolism (biology); constructive metabolism (using energy to make proteins etc) |
| 同工同酬 | tóng gōng tóng chóu | equal pay for equal work |
| 同知 | tóng zhī | government sub-prefect (old) |
| 同仁 | tóng rén | variant of 同人; Tongren county in Huangnan Tibetan autonomous prefecture 黄南藏族自治州, Qinghai |
| 一视同仁 | yī shì tóng rén | to treat everyone equally favorably (idiom); not to discriminate between people |
| 大同小异 | dà tóng xiǎo yì | virtually the same; differing only on small points |
| 同甘共苦 | tóng gān gòng kǔ | shared delights and common hardships (idiom); to share life's joys and sorrows; for better or for worse |
| 迥然不同 | jiǒng rán bù tóng | widely different; utterly different |
| 同辈 | tóng bèi | peer |
| 异口同声 | yì kǒu tóng shēng | different mouths, same voice; to speak in unison (idiom) |
| 雷同 | léi tóng | mirroring others; identical |
| 同业公会 | tóng yè gōng huì | trade association |
| 同素异形体 | tóng sù yì xíng tǐ | allotropy |
| 约同 | yuē tóng | to promise to accompany; an appointment (to go together with sb) |
| 不约而同 | bù yuē ér tóng | to agree by chance (idiom); taking the same action without prior consultation |
| 同谋 | tóng móu | to conspire with sb; to plot; a conspirator; a partner in crime; an accomplice |
| 同盟国 | tóng méng guó | allied nation; ally; confederation |
| 同僚 | tóng liáo | colleague; fellow-worker |
| 志同道合 | zhì tóng dào hé | like-minded; fellow enthusiast; kindred spirit |
| 与众不同 | yǔ zhòng bù tóng | to stand out from the masses (idiom) |
| 通同 | tōng tóng | to collude; to gang up on |
| 同感 | tóng gǎn | similar feeling; fellow felling; sympathy; understanding; consensus |
| 同道 | tóng dào | same principle |
| 中国同盟会 | Zhōng guó Tóng méng huì | Tongmenghui, Sun Yat-sen's alliance for democracy, founded 1905, became the Guomindang 国民党 in 1912 |
| 欧洲共同体 | Ōu zhōu Gòng tóng tǐ | European Community, old term for EU, European Union 欧盟 |
| 死胡同 | sǐ hú tòng | blind alley; cul-de-sac; dead end; impasse |
| 同屋 | tóng wū | roommate; CL:个 |
| 一掬同情之泪 | yī jū tóng qíng zhī lèi | to shed tears of sympathy (idiom) |
| 三代同堂 | sān dài tóng táng | three generations under one roof |
| 三马同槽 | sān mǎ tóng cáo | three horses at the same trough (idiom, alluding to Sima Yi 司马懿 and his two sons); conspirators under the same roof |
| 上同调 | shàng tóng diào | cohomology (invariant of a topological space in math.) |
| 不可同日而语 | bù kě tóng rì ér yǔ | lit. mustn't speak of two things on the same day (idiom); not to be mentioned in the same breath; incomparable |
| 不同凡响 | bù tóng fán xiǎng | lit. not a common chord (idiom); outstanding; brilliant; out of the common run |
| 不相同 | bù xiāng tóng | not the same; dissimilar |
| 中国民主同盟 | Zhōng guó Mín zhǔ Tóng méng | China Democratic League |
中华学生爱国民主
同盟 | Zhōng huá xué sheng ài guó mín zhǔ tóng méng | Patriotic Democratic Alliance of Chinese Students |
| 伴同 | bàn tóng | to accompany |
| 偕同 | xié tóng | along with; accompanied by; together with |
| 全同 | quán tóng | identical |
| 公诸同好 | gōng zhū tóng hào | to share pleasure in the company of others (idiom); shared enjoyment with fellow enthusiasts |
| 共同利益 | gòng tóng lì yì | common interest; mutual benefit |
| 共同努力 | gòng tóng nǔ lì | to work together; to collaborate |
| 共同基金 | gòng tóng jī jīn | mutual fund |
