1.
Twilight is the time just before night when the daylight has almost gone but when it is not completely dark.
= dusk
N-UNCOUNT
2.
Twilight is the small amount of light that there is outside just after the sun has gone down.
...the deepening autumn ~.
N-UNCOUNT
3.
The ~ of a particular period of time is the final stages of it, when the most important events have already happened.
Now both men are in the ~ of their careers...
N-SING: the N of n, N n
4.
A ~ state or a ~ zone is a situation of confusion or uncertainty, which seems to exist between two different states or categories.
They fell into that ~ zone between military personnel and civilian employees.
ADJ: ADJ n