twi·light

[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.
00:10
Twilight is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.

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

twi·light·y, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
twilight (ˈtwaɪˌlaɪt) [Click for IPA pronunciation guide]
 
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
But since that time she'd begun to notice at twilight a curious glistening to
  the air.
Gels live in a kind of chemical twilight zone where they share many properties
  of both phases of matter.
Twilight is the best time to venture up this abrupt peak.
In both instances, there is a twilight when everything remains seemingly
  unchanged.
Images for twilight
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