not accompanied; alone: The shipment arrived unaccompanied by an invoice.
Music. without an accompaniment: a sonata for unaccompanied violin.

1535–45; un-1 + accompanied

1. solitary, lone, unattended.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unaccompanied (ˌʌnəˈkʌmpənɪd)
1.  not accompanied
2.  music
 a.  (of an instrument) playing alone
 b.  (of music for a group of singers) without instrumental accompaniment

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

1545, "not in the company of others," from un- (1) "not" + pp. of accompany. Musical sense is first recorded 1818.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In your judgment virtue requires no reward, and is to be sought for itself,
  unaccompanied by external benefits.
Speeding traffic noise unaccompanied by pedestrian sidewalk clamor is also
  incredibly unpleasant.
The largest ever resettlement of unaccompanied minors began last week.
The city is full of spies and informers who have on occasions detained
  reporters who have been spotted unaccompanied.
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