- 第一次 dìyīcì the first timethe first time; for the first time; first
- 第一天 dìyītiān the first daythe initial day of a period or event
- 第一名 dìyīmíng first placeThe highest rank or position in a competition or ranking; the first in order of achievement.
- 第一位 dìyīwèi first placethe top position or most important priority
- 第一步 dìyībù step one; first stepthe first stage of a process or the metaphorical beginning of an endeavor
- 第一季度 dìyījìdù the first quarterThe first three months of a financial or calendar year.
- 第一轮 dìyīlún first roundthe first round of a match, tournament, or election
- 第一线 dìyīxiàn forefrontThe most crucial part of an operation; people working directly in production, teaching, research, sales, or front-line leadership
- 第一届 dìyījiè first sessionthe inaugural session or first instance of a recurring event, meeting, or congress
- 第一版 dìyībǎn first editionThe first printing or edition of a book or publication.
- 第一代 dìyīdài first generationThe first generation of a group, technology, or lineage.
- 天下第一 tiānxiàdìyī unequaledthe first under heaven; peerless; the best in the world or in the country
- 第一夫人 dìyīfūren first ladythe wife of a head of state or head of government
- 第一季 dìyījì first quarterthe first quarter of a year or the first season of a television series
- 第一手 dìyīshǒu firsthandOriginal or direct from the source
- 第一产业 dìyīchǎnyè primary industryThe primary sector of the economy, including agriculture, forestry, animal husbandry, and fishing; in some countries, this also includes mining.
- 第一流 dìyīliú first-classtop-rate; first-class; the most excellent person or thing
- 第一例 dìyīlì first casethe first recorded instance or occurrence of something; first case
- 第一声 dìyīshēng first toneThe high and level tone in Mandarin Chinese
- 第一炮 dìyīpào opening shot(figurative) the first step or opening action of an undertaking, often implying a critical start or a significant first success.
- 第一级 dìyījí first levelthe first or highest level in a hierarchy or ranking
- 第一性 dìyīxìng primaryIn philosophy, being produced first and playing a decisive role; primary or fundamental.
- 第一审 dìyīshěn first instancelegal trial of the first instance; the initial stage of a judicial hearing
- 第一把手 dìyībǎshǒu top leaderThe person in overall charge; the number one in command of an organization or leadership group
- 天字第一号 tiānzìdìyīhào number oneThe largest, highest-ranking, or most significant; formerly used in reference to the first character of the Thousand-Character Classic [[千字文|千字文|qian1 zi4 wen2]] being used as a numbering system.
- 破题儿第一遭 pòtírdìyīzāo first time everUsed to describe something that is happening for the very first time in one's life or experience.
- 第一次大战 dìyīcìdàzhàn World War IWorld War I (1914-1918)
- 第一眼 dìyīyǎn at first glanceat first sight; the very first thing seen in a specific environment or moment
- 第一级产业 dìyījíchǎnyè primary industrythe sector of an economy making direct use of natural resources, including agriculture, forestry, fishing, and mining
- 第一象限 dìyīxiàngxiàn first quadrantThe upper-right section of a coordinate plane where both the horizontal and vertical values are positive.
- 世界第一 shìjièdìyī world number oneranked number one in the world; the world's first
- 第一顺位 dìyīshùnwèi top priorityRanking first in order, position, or importance; most important
- 倒数第一 dàoshǔdìyī lastthe very last one in a series or ranking, literally meaning the first when counting backward from the bottom
- 全世界第一 quánshìjièdìyī world's firstworld's first; first in the whole world
- 国语注音符号第一式 guóyǔzhùyīnfúhàodìyīshì Mandarin Phonetic Symbols 1The official name for the Chinese phonetic system used in Taiwan, commonly known as Bopomofo; it was officially given this name in 1986 to distinguish it from the newer second-style system.
- 打第一炮 dǎdìyīpào to fire the first shotto be the first to speak or act in a campaign or competition; to take the initiative; to set a precedent
- 拿破仑第一 nápòlúndìyī Napoleon INapoleon Bonaparte (1769-1821), Emperor of the French from 1804 to 1814 and again in 1815
- 牛顿第一运动定律 niúdùndìyīyùndòngdìnglǜ Newton's first law of motionthe fundamental law of physics stating that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force
- 科学技术是第一生产力 kēxuéjìshùshìdìyīshēngchǎnlì science and technology is the primary productive forceA political slogan from a 1978 speech by [[邓小平|鄧小平|deng4 xiao3 ping2]] emphasizing scientific modernization
- 第一世界 dìyīshìjiè First World (Maoist theory)the superpowers (the USA and the USSR), as defined in Mao Zedong's Three Worlds Theory
- 第一义 dìyīyì primary meaningThe most important or basic meaning of a word; the primary principle of a matter.
- 第一义谛 dìyīyìdì paramartha-satyathe highest truth or ultimate reality in Buddhist philosophy; the supreme meaning as opposed to worldly or conventional truth
- 第一乐章曲式 dìyīyuèzhāngqǔshì sonata formsonata form, literally the musical form of the first movement
- 第一书记 dìyīshūji first secretarythe highest-ranking official within a committee or political party organization, often equivalent to a general secretary
- 第一人称 dìyīrénchēng first personRefers to the speaker or narrator; in grammar, used for words like [[我|我|wo3]] and [[我们|我們|wo3 men5]].
- 第一人称射击 dìyīrénchēngshèjī first-person shooterfirst-person shooter; a genre of video games centered on gun and other weapon-based combat from a first-person perspective
- 第一哲学 dìyīzhéxué first philosophymetaphysics, specifically the study of the fundamental nature of existence and being as originally defined in classical philosophy
- 第一国际 dìyīguójì First InternationalThe International Workingmen's Association founded in London in 1864 by Karl Marx and others, which held its first congress in Geneva in 1866 and disbanded in 1876.
- 第一型糖尿病 dìyīxíngtángniàobìng type 1 diabetesa chronic condition in which the pancreas produces little or no insulin
