(n): the time at which something is supposed to begin
(n): the smallest detectable sensation
(n): an unelaborated elementary awareness of stimulation
(n): the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close
(n): something that provides access (to get in or get out)
(n): 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
(n): structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
(n): a region marking a boundary
(n): a line determining the limits of an area
