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Hamming distance

Ham·ming dis·tance [ hámming dìstəns ]


noun 
Definition:
 
difference between letter or number sequences: a measure of the difference between two words or messages, expressed by the number of characters needing to be changed in one message to obtain the other. For example, the Hamming distance between "cheer up" and "clear up" is two.

[Mid-20th century. After R. Hamming (1915-1998), U.S. scientist]
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