The term 'unitary' is a concept that can be described in two ways: as 'SINGLE' or 'INDIVIDUAL'. Unitary is an adjective that means 'consisting of one part, element, or INDIVIDUAL'. It is often used to describe a system or organization that is governed by a SINGLE central authority. Unitary systems are typically hierarchical and centralized, with the power concentrated in the hands of a few individuals. Unitary systems are often contrasted with federal systems, which are decentralized and have multiple governing authorities.