The medical term that matches the definition of excessive development is hyperplasia.
Hyperplasia refers to an increase in the number of cells in a tissue or organ, which leads to its enlargement. This condition can occur in various parts of the body and may be a response to stimuli, such as hormonal changes or increased demand on a specific tissue. It’s essential to distinguish between hyperplasia and hypertrophy; while hyperplasia involves an increase in cell quantity, hypertrophy is characterized by an increase in cell size. Understanding these terms is crucial for comprehending various medical conditions and their underlying mechanisms.