Functional Features:
* Sittable: A chair is specifically designed for sitting on.
* Support: It provides support for the body, primarily the torso and legs.
* Stable: It must be stable enough to hold a person's weight without tipping over.
* Elevated: It raises the sitter above the ground level, though the height can vary.
Physical Features:
* Four legs: Most chairs have four legs for stability, though exceptions exist (e.g., stools).
* Backrest: Many chairs have a backrest for support and comfort.
* Seat: It has a flat or slightly curved surface to provide a place to sit.
* Made of material: Chairs are typically made from wood, metal, plastic, or fabric.
Social/Cultural Features:
* Domestic: Chairs are commonly found in homes.
* Public: Chairs are also common in public spaces (restaurants, offices, etc.).
* Varied styles: Chairs come in a wide range of styles reflecting different time periods, cultures, and functions.
Other Features:
* Usually portable: While some chairs are very large or heavy, most are designed to be moved.
* Generally not used for sleeping: This distinguishes it from beds.
These semantic features collectively define the concept of a chair, enabling us to recognize and distinguish it from other objects.