THRESHOLD

Definition

1. noun the starting point for a new state or experience.
2. noun the smallest detectable sensation. — synonyms: limen
3. noun the entrance (the space in a wall) through which you enter or leave a room or building. — synonyms: doorway, door, room_access
4. noun the sill of a door. — synonyms: doorsill, doorstep
5. noun a region marking a boundary. — synonyms: brink, verge