O

O1
(also o)
noun (plural Os or O's)
1》 the fifteenth letter of the alphabet.
2》 denoting the next after N in a set of items, categories, etc.
3》 a human blood type (in the ABO system) lacking both the A and B antigens.
4》 (also oh) zero (in a sequence of numerals, especially when spoken).
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O2
abbreviation
1》 US Ohio.
2》 Cricket (on scorecards) over(s).
symbol the chemical element oxygen.
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O3
exclamation
1》 archaic spelling of oh1.
2》 used before a name in the vocative.

English new terms dictionary. 2014.

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