First opened Tuesday, June 20, 2006
同一
どういつ
- flat (heiban)
How to read it: a line over a kana means the voice is high there, and ↓ marks where it drops. A kana with no line is low. With no ↓ the pitch stays high to the end and does not drop even on a following particle (が, は).
identity, sameness, similarity
Dōitsu is from Chinese 同一, literally “same + one”.
Taken apart
Select a part to see every word so far that is taken apart with it.
In a sentence
その２つの役は同一の女優によって演じられた。
The two parts were played by one and the same actress.
これは私が先日なくしたのと同一の鉛筆である。
This is the same pencil that I lost the other day.
Sentences are from Tatoeba (CC BY 2.0 FR), picked by fixed rules from a dated export and shown unchanged. Nobody has reviewed them one by one.
What Wiktionary says
Quoted line by line from Wiktionary's Etymology section for this reading, taken from one dated dump so it can't change underneath us. Nothing below is paraphrased.
- “From Chinese 同一 (duwng + ʔjit, literally “same + one”).”
Source: Wiktionary: 同一 (dump of 2026-09-02), available under CC BY-SA 4.0. Reading, meaning and part of speech from JMdict, and kanji readings from KANJIDIC2 (EDRDG).
What the labels mean
- 漢語 Sino-Japanese
- Words built from Chinese-derived morphemes — borrowed from Chinese or coined in Japan out of Chinese parts — read with on'yomi.
- Compound
- Two or more words or stems joined into one.
- Borrowing
- Taken over from another language.