| Definitions | noun
- The fifteenth letter of the Appendix:Roman script, English alphabet, preceded by N and followed by P.
- A blood type that has no antigens and may only receive type O blood and nothing else, but may donate to all.
abbreviation
- (cricket) The number of overs bowled.
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| noun
- The fifteenth letter of the Appendix:Roman script, English alphabet.
- A blood type that lacks antigens. They can only receive blood from type O, and cannot receive blood from A, AB or B people. Their blood can be donated to any recipient. (Neglecting Rh factor) Synonym: the universal donor.
- A zero (used in reading out numbers).
abbreviation O
- operator, Operator
- object, Object, see SVO
- over, Over
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