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Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

the smallest whole number or a numeral representing this number (Freq. 21)
- he has the one but will need a two and three to go with it
- they had lunch at one
• Syn:
one, I, ace, single, unity
• Hypernyms:
digit, figure
• Hyponyms:
monad, monas, singleton

II - adjective

used of a single unit or thing;
not two or more (Freq. 107)
- 'ane' is Scottish
• Syn:
one, i, ane
• Similar to:
cardinal