Maturation

Maturation could refer to any of the following: The process of becoming mature. The emergence of personal and behavioral characteristics through growth processes. The final stages of differentiation of cells, tissues, or organs
 * Fetal development
 * Developmental biology
 * Emotional development
 * Or physical maturation of any biological life form - see individual articles for maturation of different life forms.
 * In Research A threat to internal validity in which subjects change during the course of the experiment or even between measurements and the researcher may not be able to determine if the cause of the discrepancy is due to time or the independent variable.