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Ottawa (1)
Ottawa (2)
otter
otter board
otter hound
Otterburn
otto
Otto cycle
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ottoman
Ottoman Empire
Otway Ranges
OU
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Ouachita Mountains
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ought (2)
ought [ awt ] (plural oughts)


noun 
Definition:
 
mathematics 
Same as  zero
[Mid-18th century. < erroneous division of a nought]
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