Hierarchy is defined as a rank-ordered series of higher and lower amounts, levels, degrees, or steps; a system arranged by rank. An example of Heirarchy is Hierarchy of Needs of Psychologist Abraham Maslow's. It is a theory that human needs are arranged in an order or hierarchy based on their importance. The need hierarchy includes physiological, safety, social/love and belonging, esteem, and self -actualization needs.
Lexicon of Psychology - Terms, Treatments, Biographies,