/ ˈtwaɪlaɪt; NAmE / noun , adjective
■ noun [ U ]
1.
the faint light or the period of time at the end of the day after the sun has gone down :
It was hard to see him clearly in the twilight .
We went for a walk along the beach at twilight .
2.
the ~ (of sth) the final stage of sth when it becomes weaker or less important than it was :
the twilight years (= the last years of your life)
■ adjective [ only before noun ]
1.
( formal ) used to describe a state in which things are strange and mysterious, or where things are kept secret and do not seem to be part of the real world :
the twilight world of the occult
They lived in the twilight zone on the fringes of society.
2.
used to describe a situation or area of thought that is not clearly defined
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WORD ORIGIN
late Middle English : from Old English twi- two (used in an obscure sense in this compound) + the noun light .