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 fielding position of the player on a baseball team who is stationed at first of the bases in the infield (counting counterclockwise from home plate) |
the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close | the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving |
the smallest detectable sensation | an honours degree of the highest class |
a region marking a boundary | the first element in a countable series |
the starting point for a new state or experience | the first or highest in an ordering or series |
| the time at which something is supposed to begin |