threshold

Threshold has 2 syllables: thresh · old.

noun. 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.

noun. The entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close.

noun. The smallest detectable sensation.

noun. A region marking a boundary.