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Definition of: ocean
Our photo definition of ocean 
(ō′shən) noun
1. The great body of salt water that covers about two thirds of the earth's surface.
2. Any one of the greater tracts of water that cover the globe: the Atlantic Ocean.
3. Any unbounded expanse or quantity. [<OF <L oceanus <Gk. ōkeanos the great outer sea (as opposed to the Mediterranean), orig. Ōkeanos (potamos) (the river of) Oceanus]
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