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o

o [or] O

 
pronunciation:
o
parts of speech:
noun, adjective
part of speech: noun
inflections: O's
definition 1: the fifteenth letter of the English alphabet.
definition 2: the cipher zero.
definition 3: one of the four human blood types. (See ABO system.)
 
part of speech: adjective
definition: having the shape of an O; circular.