a sharp side formed by the intersection of two surfaces of an object | the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway |
the outside limit of an object or area or surface; a place farthest away from the center of something | the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close |
a slight competitive advantage | the smallest detectable sensation |
the attribute of urgency in tone of voice | a region marking a boundary |
the boundary of a surface | the starting point for a new state or experience |
a line determining the limits of an area | |