saturation
US /ˌsætʃ.əˈreɪ.ʃən/
UK /ˌsætʃ.əˈreɪ.ʃən/

1.
the state or process of a substance being dissolved in a solvent to the maximum extent possible.
:
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The solution reached saturation when no more salt could dissolve.
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We studied the saturation point of various gases in water.
2.
the extent to which an area is filled with a particular type of business or product.
:
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The market has reached saturation with too many coffee shops.
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There's a high saturation of fast-food restaurants in this area.