throughout

[throo-out]
preposition
1.
in or to every part of; everywhere in: They searched throughout the house.
2.
from the beginning to the end of: He was bored throughout the play.
adverb
3.
in every part: rotten throughout.
4.
at every moment or point: following the text closely throughout.

Origin:
before 1000; Middle English throw out, Old English thurh ūt through and out the other side (of). See through, out

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
throughout (θruːˈaʊt)
 
prep
1.  right through; through the whole of (a place or a period of time): throughout the day
 
adv
2.  through the whole of some specified period or area

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

throughout
late O.E. þurhut; see through + out (cf. Ger. durchaus, 16c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Throughout the year, temperatures remain extremely constant, only rising be a
  few degree during the rainy season.
Its long summer days and equally long winter nights punctuate extreme
  fluctuations in temperature and weather throughout the year.
The old town provides a perfect setting for artistic exhibitions and
  performances throughout the year.
In truth, temperatures are kept reasonably warm throughout the winter months.
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