Mesenchymal-epithelial transition, also known as MET, refers to the process in which cells that have mesenchymal characteristics, such as mobility and invasiveness, transform into cells with more epithelial-like features, such as increased adhesion and polarization. Some synonyms for MET include epithelial-mesenchymal transition reversal (EMT-R), mesenchymal-epithelial reversion (MER), and mesenchymal-epithelial conversion (MEC). MET is a critical process in embryonic development and tissue repair, but it can also play a role in cancer metastasis. Understanding the molecular mechanisms underlying MET can lead to the development of new targeted therapies for cancer treatment and tissue engineering applications.