[self-seym, -seym]
being the very same; identical.

1375–1425; late Middle English selve same; see self, same; cognate with Danish selvsamme, Old High German selbsama

selfsameness, noun

exact, very, same. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
selfsame (ˈsɛlfˌseɪm)
(prenominal) the very same

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"identical," 1408, from self + same. Written as two words until c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So every day is in fact the selfsame evening and morning.
The first is that selfsame record of sensible moderation.
And yet it is that selfsame false reputation that daily causes him the keenest
  anguish of all.
The selfsame word can at one time be the cornerstone of peace, while at
  another, machine-gun fire resounds in its every syllable.
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