the quality or state of being wearisome; irksomeness; tediousness.

1655–65; < Latin taedium

monotony, sameness, dullness.
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World English Dictionary
tedium (ˈtiːdɪəm)
the state of being bored or the quality of being boring; monotony
[C17: from Latin taedium, from taedēre to weary]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1662, from L. tædium "weariness, disgust," related to tædet "it is wearisome," and to tædere "to weary." Possible cognates are O.C.S. tezo, Lith. tingiu "to be dull, be listless."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Scientists are arguing that tedium is good for your brain.
They will experience the short school day and housework tedium.
When a paper does get published, the easiest way to debate it is to submit
  another paper, with all the tedium that entails.
The stink of exhaust, the mind-numbing tedium of traffic, parking lots
  blighting central city real estate.
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