Infill is the rededication of land in an urban environment, usually open space, to new construction. Infill may also refer to: Infill (construction), the process of leveling up a depressed surface, or the material used in that process infill another term for the rubble used in construction of core-and-veneer walls Infill (geology), the sedimentary process of filling a basin or channel, or the resultant rocks Infill (petrology), the creation of amygdules, or the resultant minerals