第一

first / number one / primary

(prefix indicating ordinal number, as in 第六[di4 liu4] "sixth") / (literary) grades in which successful candidates in the imperial examinations were placed / (old) residence of a high official / (literary) but; however / (literary) only; just

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

first under heaven / number one in the country

world's first

Mandarin Phonetic Symbols 1 (official name of the phonetic system of writing Chinese used in Taiwan) / Bopomofo / abbr. to 注音一式[zhu4 yin1 yi1 shi4]

science and technology is the number one productive force (from a 1978 speech by Deng Xiaoping 鄧小平|邓小平[Deng4 Xiao3 ping2] introducing the Four Modernizations 四個現代化|四个现代化[si4 ge5 xian4 dai4 hua4])

first case / first instance / first time (sth is done)

First international, organized by Karl Marx in Geneva in 1866

Type 1 diabetes

(math.) first fundamental form

primary sector of industry

first tone in Mandarin / high, level tone

ranked number one in the world / the world's first