boundary

A boundary is a point of separation. In its physical sense, it is a hard limit—a fence, a wall, or a line on a map—that establishes ownership or jurisdiction. In psychological and social contexts, the word shifts from a physical barrier to a conceptual one. Here, it represents an invisible threshold of acceptability. It is less about keeping people 'out' and more about defining where one person's autonomy ends and another's begins. Unlike a 'border', which often implies a political or national divide, a boundary is frequently personal or functional. While 'limit' suggests a maximum capacity or an end point, 'boundary' emphasizes the division between two distinct entities or states.