| 1 | 因为 | 因為 | yīn wèi | yin1 wei4 | because; owing to; on account of | | |
| 2 | 因此 | 因此 | yīn cǐ | yin1 ci3 | thus; consequently; as a result | | |
| 3 | 因 | 囙 | yīn | yin1 | cause; reason; because; old variant of 因 | | |
| 4 | 因素 | 因素 | yīn sù | yin1 su4 | element; factor; Classifiers: 个 | | |
| 5 | 原因 | 原因 | yuán yīn | yuan2 yin1 | cause; origin; root cause; reason; Classifiers: 个 | | |
| 6 | 因而 | 因而 | yīn ér | yin1 er2 | therefore; as a result; thus; and as a result, ... | | |
| 7 | 基因 | 基因 | jī yīn | ji1 yin1 | gene (loanword) | | |
| 8 | 因子 | 因子 | yīn zǐ | yin1 zi3 | factor; (genetic) trait; (math.) factor; divisor | | |
| 9 | 因果 | 因果 | yīn guǒ | yin1 guo3 | karma; cause and effect | | |
| 10 | 爱因斯坦 | 愛因斯坦 | ài yīn sī tǎn | Ai4 yin1 si1 tan3 | Albert Einstein (1879-1955), German-born theoretical physicist | | |
| 11 | 因地制宜 | 因地制宜 | yīn dì zhì yí | yin1 di4 zhi4 yi2 | (idiom) to use methods in line with local circumstances | | |
| 12 | 成因 | 成因 | chéng yīn | cheng2 yin1 | cause; factor; cause of formation | | |
| 13 | 病因 | 病因 | bìng yīn | bing4 yin1 | cause of disease; pathogen | | |
| 14 | 因私 | 因私 | yīn sī | yin1 si1 | private (i.e. not work-related 因公 ) | | |
| 15 | 基因体 | 基因體 | jī yīn tǐ | ji1 yin1 ti3 | genome (Tw) | | |
| 16 | 充填因数 | 充填因數 | chōng tián yīn shù | chong1 tian2 yin1 shu4 | complementary factor | | |
| 17 | 达因 | 達因 | dá yīn | da2 yin1 | dyne (loanword) | | |
| 18 | 倒果为因 | 倒果為因 | dào guǒ wéi yīn | dao4 guo3 wei2 yin1 | to reverse cause and effect; to put the horse before the cart | | |
| 19 | 陈陈相因 | 陳陳相因 | chén chén xiāng yīn | chen2 chen2 xiang1 yin1 | to follow a set routine | | |
| 20 | 病因学 | 病因學 | bìng yīn xué | bing4 yin1 xue2 | pathological science (TCM) | | |
| 21 | 最大公因子 | 最大公因子 | zuì dà gōng yīn zǐ | zui4 da4 gong1 yin1 zi3 | highest common factor HCF; greatest common divisor GCD | | |
| 22 | 本因坊秀策 | 本因坊秀策 | běn yīn fāng xiù cè | Ben3 yin1 fang1 Xiu4 ce4 | Honinbo Shusaku (1829-1862), Japanese Go player | | |
| 23 | 归因理论 | 歸因理論 | guī yīn lǐ lùn | gui1 yin1 li3 lun4 | attribution theory (psychology) | | |
| 24 | 海洛因 | 海洛因 | hǎi luò yīn | hai3 luo4 yin1 | heroin (loanword) | | |
| 25 | 侯赛因 | 侯賽因 | hóu sài yīn | Hou2 sai4 yin1 | Husain or Hussein (name); Hussein (c. 626-680), Muslim leader whose martyrdom is commemorated at Ashura; Saddam Hussein al Tikriti (1937-2006), dictator of Iraq 1979-2003 | | |