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Lengua inglesa
O1 or o
noun (Oes , Os , or o's )
1 the fifteenth letter of the English alphabet.
2 the shape of this letter formed his mouth into an O .
3 in telephone, etc jargon: zero; nought.


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O2 see under oh


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O3
abbreviation
1 Ocean.
2 (also o) octavo.
3 see under OH.
4 Old.
5 formerly, ordinary, in eg O level or O Grade.


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O4
symbol
1 chem oxygen.
2 a blood type in the ABO blood group system.


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