Expanse definitions

ĭk-spăns'
A large, open area or unbroken surface; wide extent; great breadth.
noun
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Expansion.
noun
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A wide and open extent, as of surface, land, or sky.
noun
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The definition of an expanse is the distance to which something can grow or expand, or a vast open surface.

When a bird can open its wings very wide, this is an example of when the bird has a wide expanse.

When you look out over the vast surface of the Atlantic Ocean, this is an example of when you look out over the ocean's expanse.

noun
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Expansion.
noun
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The distance or amount of expansion.
noun
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A wide stretch, usually of sea, sky, or land.
noun
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An amount of spread or stretch.
noun
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Origin of expanse

Latin expānsum from neuter past participle of expandere to spread out expand