not seen; unperceived; unobserved; invisible.
recognized or comprehended without prior study, as a written text or musical score.

1150–1200; Middle English unsene, unsehene; see un-1, seen

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unseen (ʌnˈsiːn)
1.  not observed or perceived; invisible
2.  (of passages of writing) not previously seen or prepared
3.  chiefly (Brit) a passage, not previously seen, that is presented to students for translation

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

early 13c., from un- (1) "not" + pp. of see (v.). Cf. O.E. ungesewen, M.Du. ongesien, Du. ongezien, O.H.G. ungesëhan, Ger. ungesehen, O.N. usenn.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


see sight unseen.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Nuns sang unseen beyond the altar and people flocked to hear their hidden
She also ponders the makeup of dark matter, unseen particles that have shaped
  the growth of the entire cosmos.
Closer to my lofty perch, a bald eagle plunges toward unseen prey in the lake's
  blue waters.
If at all possible, do not to take a place site unseen.
Idioms & Phrases
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