Webster's English Dictionary

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oh

1. oh \(')o-\ ij [ME o] 1: - used to express various emotions (as 
   astonishment, pain, or desire)  2: - used in direct address {Oh, porter! 
   Will you come here, ple ase?}
2. oh \'o-\ n [o; fr. the similarity of the symbol for zero (0) to the 
   letter O] : ZERO