Demarcate is a verb that means to set boundaries or define limits. There are several words that can be used as synonyms for demarcates, such as delineates, specifies, defines, circumscribes, outlines, and establishes. Delineate emphasizes the act of marking boundaries with clarity, while specify implies setting forth in precise detail. Define means to establish meaning or boundaries in clear terms, and circumscribe indicates the act of defining limits to restrict or encircle. Outline suggests sketching out a rough draft of boundaries while establish implies laying down a firm and solid foundation for limits. All these synonyms can be used interchangeably with demarcates depending on the context and the type of boundaries being defined.