The developmental process, independent of morphogenetic (shape) change, that is required for a columna/cuboidal epithelial cell to attain its fully functional state. A columnar/cuboidal epithelial cell is a cell usually found in a two dimensional sheet with a free surface. Columnar/cuboidal epithelial cells take on the shape of a column or cube. (Gene Ontology, GO_0002069)
7 genes participating in the columnar/cuboidal epithelial cell maturation biological process from the curated GO Biological Process Annotations dataset.