guesswork

[ges-wurk]
noun
work or procedure based on or consisting of the making of guesses or conjectures.

Origin:
1715–25; guess + work

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World English Dictionary
guesswork (ˈɡɛsˌwɜːk)
 
n
1.  a set of conclusions, estimates, etc, arrived at by guessing
2.  the process of making guesses

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Example sentences
The river itself was not known, and it was placed on the map by guesswork.
There is no need of fanciful guesswork in order to enhance the startling
  character of the discovery.
Finding pieces of the spinal column joined together eliminates guesswork over
  how they articulated in life.
Most situations for that matter are too open-ended to be much more than
  guesswork.
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