二
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In real, traceable use. Part of the curated seed collection; community review is coming.
The number two, as used in counting, in larger numbers and in dates. 十二 is twelve, 二十 twenty, 第二 'second', 二月 February. To count two of something, however, Chinese switches to another word, 两 liǎng, in front of the measure word: 两个人 'two people', 两本书 'two books', and likewise 两点 'two o'clock'.
Số hai, dùng khi đếm, trong các số lớn hơn và trong ngày tháng. Ví dụ: 十二 (mười hai), 二十 (hai mươi), 第二 (thứ hai, thứ nhì), 二月 (tháng hai). Nhưng khi nói “hai cái gì đó”, trước lượng từ tiếng Trung lại dùng một từ khác là 两 liǎng: 两个人 (hai người), 两本书 (hai quyển sách), và cả 两点 (hai giờ).
NumeralRegister: neutral
Examples
Editorial example (illustrative, not a corpus attestation) — awaiting a native-speaker check
Sources & notes
Hán-Việt bridge batch 063 (2026-11-14). Headword, Traditional form and pinyin checked against CC-CEDICT (CC BY-SA 4.0) source ↗ · Hán-Việt reading: Unihan kVietnamese source ↗ ; en.wiktionary Vietnamese entries via kaikki.org extract, snapshot 2026-07-31 (CC BY-SA 4.0): Hán-Việt reading 二 = nhị · 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 “二” mean?
The number two, as used in counting, in larger numbers and in dates. 十二 is twelve, 二十 twenty, 第二 'second', 二月 February. To count two of something, however, Chinese switches to another word, 两 liǎng, in front of the measure word: 两个人 'two people', 两本书 'two books', and likewise 两点 'two o'clock'.
Is “二” formal or informal?
二 is generally neutral.