The process of growing. Full development; maturity. Development from a lower or simpler to a higher or more complex form; evolution. An increase, as in size, number, value, or strength; extension or expansion: population growth. Something that grows or has grown: a new growth of grass. Pathology An abnormal mass of tissue, such as a tumor, growing in or on a living organism. A result of growth; a product: concerns that are a growth of the new responsibilities. Expected to have or investing in businesses expected to have higher-than-average increases in revenues and returns: a growth stock; a growth fund.