| 聚变反应 | jù biàn fǎn yìng | nuclear fusion |
| 反过来说 | fǎn guò lái shuō | on the other hand |
| 反动分子 | fǎn dòng fèn zǐ | reactionaries; reactionary elements |
| 反应时间 | fǎn yīng shí jiān | response time (technology) |
| 反映论 | fǎn yìng lùn | theory of reflection (in dialectic materialism), i.e. every perception reflects physical reality |
| 肃反 | sù fǎn | purge of counter-revolutionary elements (esp. Stalin's purges of the 1930 and Mao's purges 1955-57); abbr. for 肃清反革命分子 |
| 反刍 | fǎn chú | to ruminate; to chew the cud |
| 反接 | fǎn jiē | trussed; with hands tied behind the back |
| 谋反 | móu fǎn | to plot a rebellion; to conspire against the state |
| 反右派斗争 | fǎn yòu pài dòu zhēng | struggle against rightist faction (Maoist purge of 1957) |
| 反潜 | fǎn qián | anti-submarine; antisubmarine |
| 反切 | fǎn qiè | traditional system expressing the phonetic value of a Chinese character using two other characters, the first for the initial consonant, the second for the rhyme and tone |
| 反叛 | fǎn pàn | rebel; revolt |
| 反手 | fǎn shǒu | to turn a hand over; to put one's hand behind one's back; fig. easily done |
| 反省 | fǎn xǐng | to engage in introspection; soul-searching |
| 反杜林论 | fǎn dù lín lùn | Anti-Dühring |
| 放热反应 | fàng rè fǎn yìng | exothermic reaction |
| 反面人物 | fǎn miàn rén wù | negative character; bad guy (in a story) |
| 连锁反应 | lián suǒ fǎn yìng | chain reaction |
| 倒反 | dào fǎn | instead; on the contrary; contrary (to expectations) |
| 反诉 | fǎn sù | counter-claim; counter-charge (law) |
| 反冲 | fǎn chōng | recoil (of a gun); to bounce back; backlash |
| 反射弧 | fǎn shè hú | reflex arc |
| 反光镜 | fǎn guāng jìng | reflector; reflecting mirror |
| 反证 | fǎn zhèng | disproof; rebuttal; reductio ad absurdum |
| 核反应堆 | hé fǎn yìng duī | nuclear reactor |
| 反思 | fǎn sī | to think back over sth; to review; to revisit; to rethink; reflection; reassessment |
| 一反常态 | yī fǎn cháng tài | complete change from the normal state (idiom); quite uncharacteristic; entirely outside the norm; out of character |
| 三反 | sān fǎn | "Three Anti" campaign (anti-corruption, anti-waste, anti-bureaucracy), early PRC purge of 1951-52 |
| 三反运动 | sān fǎn yùn dòng | "Three Anti" campaign (anti-corruption, anti-waste, anti-bureaucracy), early PRC purge of 1951-52 |
| 偶联反应 | ǒu lián fǎn yìng | chain reaction (chemistry) |
| 免疫反应 | miǎn yì fǎn yìng | immune response |
| 出尔反尔 | chū ěr fǎn ěr | old: to reap the consequences of one's words (idiom, from Mencius); modern: to go back on one's word; to fail to keep a promise; to contradict oneself; inconsistent |
| 动力反应堆 | dòng lì fǎn yìng duī | power reactor |
| 原子反应堆 | yuán zǐ fǎn yìng duī | atomic reactor |
| 反之亦然 | fǎn zhī yì rán | vice versa |
| 反人道罪 | fǎn rén dào zuì | a crime against humanity |
| 反人道罪行 | fǎn rén dào zuì xíng | crime against humanity |
| 反人类 | fǎn rén lèi | inhuman |
| 反人类罪 | fǎn rén lèi zuì | crimes against humanity |
| 反例 | fǎn lì | counter-example |
| 反侧 | fǎn cè | to toss and turn |
| 反传算法 | fǎn chuán suàn fǎ | back propagation algorithm |
| 反倾销 | fǎn qīng xiāo | anti-dumping |
| 反光面 | fǎn guāng miàn | reflecting surface |
| 反共 | fǎn gòng | anti-communist |
| 反共主义 | fǎn gòng zhǔ yì | anti-communism |
| 反共宣传 | fǎn gòng xuān chuán | anticommunist propaganda (as a crime) |
| 反共宣传罪 | fǎn gòng xuān chuán zuì | the crime of anticommunist propaganda |
| 反其道而行之 | fǎn qí dào ér xíng zhī | to do the very opposite; to act in a diametrically opposite way |
