Perimeter is a term used to describe the boundary of an object, area or region. Synonyms for perimeter include boundary, circumference, edge, margin, fringe, rim, and outline. These words all refer to the theoretical, physical, or conceptual border of something. They are used to indicate the extent of a space, indicating where it begins and ends. The perimeter can be small, large, regular, irregular, defined or undefined, depending on the specific context in which it is used. The choice of synonym used depends on the context and purpose of communication, but they all point to the same meaning.