Definitions for "Compartments"
In developmental biology, compartments are fields of cells of distinct cell lineage, cell affinity, and genetic identity. In a developing organ, all cells within a compartment possess similar affinities, and so intermingle with each other. However, cells in neighbouring compartments have different cell affinity values and so never mix, thereby restricting the movement of cells to within compartments.
Separate areas within a forest normally planted at different times.