1. The second stage of the erosion cycle in the topographic development of a landscape or region characterized by numerous and closely spaced mature streams, reduction of level surfaces to slopes, large well-defined drainage systems, and the absence of swamps or lakes on the uplands. Also known as topographic maturity.

2. A stage in the development of a shore or coast that begins with the attainment of a profile of equilibrium.

3. The extent to which the texture and composition of a clastic sediment approach the ultimate end product.

4. The stage of stream development at which maximum vigor and efficiency has been reached.