twilight

[twahy-lahyt]
noun
1.
the soft, diffused light from the sky when the sun is below the horizon, either from daybreak to sunrise or, more commonly, from sunset to nightfall.
2.
the period in the morning or, more commonly, in the evening during which this light prevails.
3.
a terminal period, especially after full development, success, etc.: the twilight of his life.
4.
a state of uncertainty, vagueness, or gloom.
adjective
5.
of, pertaining to, or resembling twilight; dim; obscure: in the twilight hours.
6.
appearing or flying at twilight; crepuscular.

Origin:
1375–1425; late Middle English; see twi-, light1

twilighty, adjective
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Collins
World English Dictionary
twilight (ˈtwaɪˌlaɪt)
 
n
1.  the soft diffused light occurring when the sun is just below the horizon, esp following sunsetRelated: crepuscular
2.  the period in which this light occurs
3.  the period of time during which the sun is a specified angular distance below the horizon (6°, 12°, and 18° for civil twilight, nautical twilight, and astronomical twilight, respectively)
4.  any faint light
5.  a period in which strength, importance, etc, are waning: the twilight of his life
6.  (modifier)
 a.  of or relating to the period towards the end of the day: the twilight shift
 b.  of or relating to the final phase of a particular era: the twilight days of the Bush presidency
 c.  denoting irregularity and obscurity: a twilight existence
 
Related: crepuscular
 
[C15: literally: half-light (between day and night), from Old English twi- half + light1]
 
twilit
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

twilight
late 14c. (twilighting), a compound of twi- + light (n.) Cognate with Du. tweelicht (16c.), Ger. zwielicht. Exact connotation of twi- in this word is unclear, but it appears to refer to "half" light, rather than the fact that twilight occurs twice
a day. Cf. also Skt. samdhya "twilight," lit. "a holding together, junction," M.H.G. zwischerliecht, lit. "tweenlight." Originally and most commonly in Eng. with ref. to evening twilight but occasionally used of morning twilight (a sense first attested mid-15c.). Figurative extension is first recorded c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Outside, the trees on the plaza start to fade into twilight.
Gels live in a kind of chemical twilight zone where they share many properties
  of both phases of matter.
It was an appropriate time of day, as the entire shuttle program has entered
  its twilight hours.
He stepped out into the twilight, looked back upon the narrow little pulpit
  with a weary smile, and locked the door.
Images for twilight
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