An Etymological Dictionary of Astronomy and Astrophysics

1. The act or process of concreting or becoming substantial.
   

2. The state of being concreted.
   

3. Geology: A hard, dense mass of mineral matter
   that formed within a rock of a composition different from its own through the precipitation of minerals and ranging in diameter from centimeters to meters.

See also: Verbal noun of → concrete.