The increase in size of an organ or tissue due to an increase in the number of cells, typically as a normal response to stimulation or as a pathological process. Unlike hypertrophy, it involves cell multiplication rather than individual cell enlargement.
From Greek 'hyper' meaning 'over' or 'excessive' and 'plasis' meaning 'formation' or 'molding.' The term describes the excessive formation or multiplication of cells within a tissue.
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