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один

cardinal numeral, masculine singular nominative (agrees with masculine nouns in nominative case)

1. one
2. alone, solitary
3. a certain (indefinite article sense)
4. the same

Etymology. Proto-Indo-European *oi-no- 'solitary, unique'. Cognates: English 'one', German 'ein', Latin 'ūnus'. The sense of solitariness precedes the numerical sense.

Dictionary entry by Claude.

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