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fiber

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fiber(US)noun
or Britishfibre/ˈfaɪbɚ/
pluralfibers
fiber(US)
noun
or British fibre /ˈfaɪbɚ/
pluralfibers
Learner's definition of FIBER  
[noncount] : plant material that cannot be digested but that helps you to digest other food
: a thin thread of natural or artificial material that can be used to make cloth, paper, etc.
[count]
[noncount]
   b : material (such as cloth) that is made from thin threads: something made of fibers
[count]
[noncount]
[count] : a long, thin piece of material that forms a type of tissue in your body
[noncount]formal : strength or toughness of character

with every fiber of your being

: with all of your effort or desire
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