- 第一次 dìyīcì first timethe first time; for the first time
- 第一个 dìyīgè the firstthe initial item in a sequence or series.
- 第一名 dìyīmíng first placethe position of highest rank or achievement in a competition, ranking, or test; the champion
- 第一步 dìyībù first stepthe initial stage or action in a process or sequence of events
- 第一季度 dìyījìdù first quarterthe first quarter (of a financial year)
- 第一轮 dìyīlún first roundThe first round (of a match, competition, or election).
- 第一线 dìyīxiàn forefrontthe most direct or active level of participation in work, production, or a social initiative
- 天下第一 tiānxiàdìyī unrivaledThe best in the world; number one under heaven; unsurpassed.
- 第一夫人 dìyīfūrén First Ladythe wife of a head of state (especially a president)
- 第一手 dìyīshǒu firsthandfirst-hand
- 第一产业 dìyīchǎnyè primary industryprimary sector of industry
- 第一流 dìyīliú first-class
- 第一例 dìyīlì casethe very first recorded instance or occurrence of a specific event, condition, or phenomenon
- 第一声 dìyīshēng first tonethe first of the four tones in Mandarin Chinese, characterized as a high, level pitch
- 第一炮 dìyīpào opening shot(fig.) opening shot; first major effort
- 第一级 dìyījí first level
- 第一把手 dìyībǎshǒu top leaderthe person in charge or the head of a leadership group or organization
- 破题儿第一遭 pòtírdìyīzāo first timeThe very first time one experiences something, especially something significant or unusual.
- 第一作者 dìyīzuòzhě first authorfirst author (of an academic paper)
- 第一岛链 Dìyī Dǎoliàn First Island Chain(geopolitics) First Island Chain, a strategic arc of islands including Japan, Taiwan and the Philippines
- 第一人称射击 dìyīrénchēngshèjī first-person shooterfirst-person shooter (video game genre)
- 第一时间 dìyīshíjiān immediatelyin the first moments of something happening or as the very first priority
- 第一桶金 dìyītǒngjīn initial profitthe first significant sum of money or profit earned from an economic endeavor or business venture
- 第一世界 Dìyī Shìjiè First World
- 第一次世界大战 Dìyīcì Shìjiè Dàzhàn World War IWorld War One
- 科学技术是第一生产力 kēxuéjìshùshìdìyīshēngchǎnlì primary productive forcescience and technology is the number one productive force (from a 1978 speech by Deng Xiaoping introducing the Four Modernizations)
- 第一眼 dìyīyǎn at first sightat the first time seeing something or someone; at first glance
- 国语注音符号第一式 Guóyǔzhùyīnfúhàodìyīshì BopomofoThe official phonetic system (Mandarin Phonetic Symbols 1) used for transcribing Mandarin Chinese in Taiwan, commonly abbreviated as [[注音一式|注音一式|zhu4 yin1 yi1 shi4]].
- 第一型糖尿病 dìyīxíngtángniàobìng type 1 diabetesType 1 diabetes
- 全世界第一 quánshìjièdìyī world's bestnumber one in the world; world's first
- 第一基本形式 dìyījīběnxíngshì first fundamental form(math.) first fundamental form
- 世界第一 shìjièdìyī top-rankedranked number one in the world
- 第一国际 dìyīguójì First InternationalThe First International, an international socialist organization organized by Karl Marx.
