crepuscular

[kri-puhs-kyuh-ler]
adjective
1.
of, pertaining to, or resembling twilight; dim; indistinct.
2.
Zoology. appearing or active in the twilight, as certain bats and insects.

Origin:
1660–70; crepuscule + -ar1

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World English Dictionary
crepuscular (krɪˈpʌskjʊlə)
 
adj
1.  of or like twilight; dim
2.  (of certain insects, birds, and other animals) active at twilight or just before dawn
 
[C17: from Latin crepusculum dusk, from creper dark]

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Dictionary.com's 21st Century Lexicon
Main Entry:  crepuscular1
Part of Speech:  adj
Definition:  pertaining to twilight, esp. in dimness
Etymology:  Latin crepusculum
Main Entry:  crepuscular2
Part of Speech:  adj
Definition:  appearing or active at twilight
Etymology:  Latin crepusculum
Usage:  zoology
Dictionary.com's 21st Century Lexicon
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Etymonline
Word Origin & History

crepuscular
fig. use from 1660s; lit. use from 1755, from L. crepusculum "twilight." Especially of morning twilight.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The crepuscular lighting sometimes makes it difficult to read the menu.
It has not anything to do with this walk, this is called a crepuscular walk.
Shea maneuvered around the crepuscular world of back rooms, board rooms and
  banquet halls.
Look for great horned owls and other crepuscular animals during a walk.
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