if you look at a globe, you can see that the "different" oceans are all connected, but people NECESSARILY had boats before they had globes 

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if you're in old-time Europe, then the body of water your boat needs to cross to get to the New World is the, or an, ocean, but when it turns out that there's more water west of America, it's natural to think of that as "another" ocean
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if you're thinking as a human with a boat looking at the water on the horizon, rather than a non-boat internet human looking at a graphical representation of the world that includes Cape Horn (after humans with boats did all the charting work to give you the representation)
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This is probably true but there also *is* more than one ocean, in the same way that there is more than one country: What counts as a given ocean isn't defined purely by physical features.
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I mean, not "physical" so much as "topological." An ocean is a body of water that cannot be partitioned into two nonempty bodies of water which are open in the relative topology
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