hindsight

[hahynd-sahyt]
noun
recognition of the realities, possibilities, or requirements of a situation, event, decision etc., after its occurrence.

Origin:
1850–55; hind1 + sight

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World English Dictionary
hindsight (ˈhaɪndˌsaɪt)
 
n
1.  the ability to understand, after something has happened, what should have been done or what caused the event
2.  a firearm's rear sight

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

hindsight
early 19c., "backsight of a firearm," from hind (adj.) + sight. Meaning "seeing what has happened" is from 1883, probably formed on model of foresight.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But in hindsight, it might have been one of the best strategies for investors.
Everyone's a genius in hindsight.
In that regard, of course, hindsight is a wonderful thing.
One advantage they have, however, is the hindsight of learning from some of our
  mistakes.
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