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osmosis

Osmosis is the distribution of liquid with a low concentration flowing through a membrane into an area with a higher concentration resulting in the concentrations being equal on both sides. (noun)

An example of osmosis is when red blood cells, which have a high concentration of protein and salt, are placed in a lower concentration fluid like water, the water will rush into the red blood cells.

Osmosis is gradual absorption. (noun)

An example of osmosis is slowly learning how to sew after sitting next to an experience seamstress.

See osmosis in Webster's New World College Dictionary