1. the process of growth or increase, typically by the gradual accumulation of additional layers or matter
2. something formed by such accumulation
3. the process by which separate things grow together or become attached
Usage: biology; geology

Examples

• The coral reef grew through the slow accretion of calcium carbonate over centuries.
• Ice accretion on the airplane wings posed a safety hazard.
• The river delta formed by accretion of sediment carried downstream.
• The company’s success came through the gradual accretion of small improvements.
• Accretion of dust and debris created the planetary rings.
• The stalactites were formed by mineral accretion over thousands of years.