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Etymology data from Wiktionary via Wiktextract (CC BY-SA 4.0). Chinese character data from the 說文解字, the Taiwan MOE 國語辭典簡編本 (CC BY-ND 3.0 TW) and HSK/TOCFL lists.

Explanations are written by a local model (gemma4) and only published after a verification pass against the cited sources. How it works.

Chinese

日

rì
Sun
  • Pictogram
  • HSK 1
  • TOCFL 2
  • radical 日
  • 4 strokes

Etymology graph

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  • derived
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  • meaning component
  • sound component
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Origin

The character 日 is a pictogram of the sun. In its earlier forms, a dot or line was added to the center to distinguish it from visually similar characters like 口. The Shuowen Jiezi describes it as the essence of the sun that never diminishes, noting it is a pictogram composed of 囗 and 一. Its earliest attested forms appear in oracle bone, bronze, chu, qin, seal, and regular scripts.

It is reconstructed as coming from Proto-Sino-Tibetan *ku-ni(k). This root has cognates in Tibetan ཉི་མ (sun, day), Burmese နေ (sun) and နေ့ (day), S'gaw Karen နံၤ (day), and Nuosu ꑍ (day, daytime). The character may have functioned as a substitute for 入 to preserve a specific pronunciation. Its development was possibly due to the assimilation of 金 (kim) and 日 (nyit).

Graphically, the character contains the components 口 (mouth) and 一 (one).

Confidence: high · written by gemma4:26b, checked statement-by-statement against the sources below.

在字形演變上，日被視為一種象形字。其早期的形式可與天文占星中的太陽符號（☉）以及埃及象形文字（𓇳）進行比較。此外，該字也被認為是「入」的一個替代字，用以保留「入」在現代預期的發音。

從語言學角度來看，日可能源自原始漢藏語的 *ku-ni(k)。它與藏語的 ཉི་མ (nyi ma)、緬甸語的 နေ (ne, 「太陽」) 與 နေ့ (ne., 「日子」)、斯嘉語 Karen 的 နံၤ (nĩ) 以及諾蘇語的 ꑍ (nyip) 互為同源詞。另有可能是由於「金」(kim) 與「日」(nyit) 的同化作用所致，值得注意的是，「金」在中古漢語與上古漢語的結尾音為 /m/。

Confidence: high · written by gemma4:26b, checked statement-by-statement against the sources below.

Lineage

  • partChinese口 “mouth, especially the lips and internal mouth cavity (Classifier: 把 c)”
  • partChinese一 “one”

Related: Tibetan ཉི་མ, Burmese နေ, Burmese နေ့, S'gaw Karen နံၤ, Nuosu ꑍ

Words built on it: 時, 早, 晚, 生日, 者, 曏, 星期日, 夏, 日子, 春

Wiktionary etymology text
Etymology 1

Pictogram (象形) – the sun. A dot or line was added in the centre to distinguish it from visually similar characters, e.g. 口 (kǒu). Compare earlier forms of the character with the astronomical and astrological symbol for the Sun (☉) and the Egyptian hieroglyph 𓇳.

From Proto-Sino-Tibetan *ku-ni(k). Cognate to Tibetan ཉི་མ (nyi ma, “sun, day”), Burmese နေ (ne, “sun”) or Burmese နေ့ (ne., “day”), S'gaw Karen နံၤ (nĩ, “day”), and Nuosu ꑍ (nyip, “day, daytime”).

Etymology 2

Essentially a substitute character for 入 (MC nyip, “to enter”) that preserves the expected modern pronunciation of 入; see the etymology there for more.

Etymology 3

Possibly due to assimilation of 金 (kim) and 日 (nyit). Note that 金 ends with /m/ in Old and Middle Chinese.

From Wiktionary, CC BY-SA 4.0.

Meanings

character
  1. Sun
  2. daytime; time between sunrise and sunset
  3. day; twenty-four hours
  4. everyday; daily; day-to-day
  5. day of the month
  6. some day; some other time

Shuowen Jiezi 說文解字

日：實也。太陽之精不虧。从囗一。象形。凡日之屬皆从日。

Xu Shen, c. 100 CE — the first analytical dictionary of Chinese characters.

國語辭典 definitions

  1. 太陽。 例：日月、旭日東昇
  2. 白天，日出到日落的一段時間。與「夜」相對。 例：日間、夜以繼日
  3. 每天、一天天。 例：日記、日日新
  4. 特定的一日。 例：生日、國慶日
  5. 季節。 例：春日、冬日
  6. 光陰。 例：曠日費時

© Ministry of Education, Taiwan — CC BY-ND 3.0 TW, shown unaltered.

How 日 was written 字形演變

  1. 日 in Oracle bone script
    Oracle bone
    甲骨文
    Shang, c. 1250–1050 BCE
  2. 日 in Bronze script
    Bronze
    金文
    Shang–Zhou
  3. 日 in Chu slips & silk script
    Chu slips & silk
    楚系簡帛
    Warring States
  4. 日 in Qin slips script
    Qin slips
    秦系簡牘
    Qin
  5. 日 in Small seal script
    Small seal
    說文小篆
    Shuowen, c. 100 CE
  6. 日 in Regular script
    Regular
    楷書
    since c. 200 CE

Historical forms collected by the legacy etymfun dataset; most characters have several attested variants.

Sources

  • etymagent (local gemma4:26b) — Generated
  • Structural decomposition (chaizi) — See upstream
  • Historical glyph forms (zdic.net 字形演变) — Rights unverified
  • HSK / TOCFL word lists — Facts (levels)
  • 教育部《國語辭典簡編本》 (Taiwan MOE) — CC BY-ND 3.0 TW
  • 說文解字 Shuowen Jiezi (Xu Shen, c. 100 CE) — Public domain
  • Written form — n/a
  • Wiktionary (via Wiktextract / kaikki.org) — CC BY-SA 4.0
  • Wiktionary: 日