threshold

noun
C1+
OPAL
1
C1+
the floor or ground at the bottom of a doorway, considered as the entrance to a building or room
آستانه, آستان
2
C1+
the level at which something starts to happen or have an effect
آستانه, سطح شروع, حد آغازی, سرآغاز
He has a low boredom threshold.
I have a high pain threshold.
My earnings are just above the tax threshold.
3
C1+
the point just before a new situation, period of life, etc. begins
آستانه, نقطه آغاز
She felt as though she was on the threshold of a new life.