同一
Meanings
noun which may take the genitive case particle 'no', na-adjective
identical; same; one and the same
Used for things that are exactly the same in identity, content, or value. Often appears in formal or technical contexts.
These two documents have identical content.
The culprit is believed to be the same person.
noun which may take the genitive case particle 'no', na-adjective
equal; fair; without discrimination
Used for equal treatment or conditions, often in legal, business, or policy contexts. Implies no unfair distinction.
Apply the same standards to all employees.
Equal pay for equal work is the principle.
Usage patterns
- 〈物〉と同一であるto be identical to X
This fingerprint is identical to the culprit's.
- 〈人〉を〈相手〉と同一に扱うto treat X the same as Y
The company should treat full-time and part-time workers equally.
- 同一の〈物〉the same X (used before a noun)
Everyone must submit the same document.