Stratify is a term used in many different fields, including biology, sociology, and geology. In biology, stratify means to divide into layers or classes based on characteristics such as age, sex, or species. In sociology, stratify means to divide into social classes based on wealth, power, or prestige. In geology, stratify means to divide into layers based on composition or age. The crossword solution for the term stratify is 'COAT, ' which can refer to the process of stratification, where a layer of material is added to something to form a protective layer.