第
dì
In real, traceable use. Part of the curated seed collection; community review is coming.
Put before a number to make it an ordinal: first, second, third and so on. 第一 is 'first' and 第二 'second'; a measure word or a noun can follow, as in 第三天 'the third day'. Months and weekdays do without it: 二月 is February and 星期二 Tuesday.
Đặt trước số đếm để chỉ thứ tự, giống “thứ” trong “thứ nhất”, “thứ hai”. 第一 là “thứ nhất”, 第二 là “thứ hai”; sau đó có thể thêm lượng từ hay danh từ: 第三天 (ngày thứ ba). Tên tháng và thứ trong tuần thì không dùng: 二月 là tháng Hai, 星期二 là thứ Ba.
NumeralRegister: neutral
Examples
Editorial example (illustrative, not a corpus attestation) — awaiting a native-speaker check
Sources & notes
Hán-Việt bridge batch 064 (2026-11-14). Headword, Traditional form and pinyin checked against CC-CEDICT (CC BY-SA 4.0) source ↗ · Hán-Việt reading: Unihan kVietnamese source ↗ · No Vietnamese entry is linked as its twin; the Hán-Việt reading is given character by character. Definition, literal gloss and example sentence are original; the example has not had a native-speaker check yet.
Common questions
What does “第” mean?
Put before a number to make it an ordinal: first, second, third and so on. 第一 is 'first' and 第二 'second'; a measure word or a noun can follow, as in 第三天 'the third day'. Months and weekdays do without it: 二月 is February and 星期二 Tuesday.
Is “第” formal or informal?
第 is generally neutral.