| 理 | lǐ | texture; grain (of wood); inner essence; intrinsic order; reason; logic; truth; science; natural science (esp. physics); to manage; to pay attention to; to run (affairs); to handle; to put in order; to tidy up |
| 理论 | lǐ lùn | theory; CL:个 |
| 理解 | lǐ jiě | to comprehend; to understand; comprehension; understanding |
| 理想 | lǐ xiǎng | a dream; an ideal; perfection; ideal; perfect; desirable; CL:个 |
| 理由 | lǐ yóu | reason; grounds; justification; CL:个 |
| 理性 | lǐ xìng | reason; rationality; rational |
| 理事 | lǐ shì | member of council |
| 理事会 | lǐ shì huì | council |
| 理学 | lǐ xué | School of Principle; Neo-Confucian Rationalistic School (from Song to mid-Qing times, c. 1000-1750, typified by the teachings of Cheng Hao 程颢, Cheng Yi 程颐 and Zhu Xi 朱熹) |
| 理智 | lǐ zhì | reason; intellect; rationality |
| 理化 | lǐ huà | physical and chemical |
| 理性认识 | lǐ xìng rèn shi | cognition; rational knowledge |
| 理发 | lǐ fà | a barber; hairdressing |
| 理会 | lǐ huì | to understand; to pay attention to; to take notice of |
| 理所当然 | lǐ suǒ dāng rán | as it should be by rights (idiom); proper and to be expected as a matter of course; inevitable and right |
| 理直气壮 | lǐ zhí qì zhuàng | in the right and self-confident (idiom); bold and confident with justice on one's side; to have the courage of one's convictions; just and forceful |
| 理应 | lǐ yīng | should; ought to |
| 理解力 | lǐ jiě lì | understand; ability to grasp ideas |
| 理财 | lǐ cái | financial management; finance |
| 理睬 | lǐ cǎi | to heed; to pay attention to |
| 理当 | lǐ dāng | should; ought |
| 理事长 | lǐ shì zhǎng | director general |
| 理光 | Lǐ guāng | Ricoh, Japanese imaging and electronics company |
| 理则 | lǐ zé | principle; logic |
| 理则学 | lǐ zé xué | logic |
| 理化因素 | lǐ huà yīn sù | physical and chemical factors |
| 理塘 | Lǐ táng | Litang county (Tibetan: li thang rdzong) in Garze Tibetan autonomous prefecture 甘孜藏族自治州, Sichuan (formerly in Kham province of Tibet) |
| 理塘县 | Lǐ táng xiàn | Litang county (Tibetan: li thang rdzong) in Garze Tibetan autonomous prefecture 甘孜藏族自治州, Sichuan (formerly in Kham province of Tibet) |
| 理学家 | lǐ xué jiā | Rationalist or follower of Rationalism or Neo-Confucianism 理学 |
| 理学硕士 | lǐ xué shuò shì | M.Sc. (Master of Science degree) |
| 理学硕士学位 | lǐ xué shuò shì xué wèi | Master of Science (MSc degree) |
| 理屈词穷 | lǐ qū cí qióng | faulty argument and poor rhetoric (idiom); unable to put forward any convincing arguments; without a leg to stand on |
| 理工 | lǐ gōng | science and engineering as academic subjects |
| 理工大学 | lǐ gōng dà xué | University of Science and Engineering; also sometimes Institute of Technology |
| 理工科 | lǐ gōng kē | science and engineering as academic subjects |
| 理念 | lǐ niàn | idea; concept; philosophy; theory |
| 理性主义 | lǐ xìng zhǔ yì | rationalism |
| 理性知识 | lǐ xìng zhī shi | rational knowledge |
| 理性与感性 | Lǐ xìng yǔ gǎn xìng | Sense and sensibility, novel by Jane Austen 珍・奥斯汀 |
| 理想化 | lǐ xiǎng huà | to idealize |
| 理想国 | lǐ xiǎng guó | ideal state; Plato's republic (c. 390 BC) |
| 理查 | Lǐ chá | Richard (name) |
| 理查德 | Lǐ chá dé | Richard (name) |
| 理查森 | Lǐ chá sēn | Richardson (name) |
| 理气 | lǐ qì | to rectify [qi4] (traditional Chinese medicine) |
| 理气化痰 | lǐ qì huà tán | to rectify [qi4] and transform phlegm (traditional Chinese medicine) |
| 理疗 | lǐ liáo | physiotherapy |
| 理疗师 | lǐ liáo shī | physiotherapist |
| 理神论 | lǐ shén lùn | deism, theological theory of God who does not interfere in the Universe |
| 理科 | lǐ kē | the sciences (as opposed to the humanities 文科) |
