Etymology
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unaccompanied (adj.)

1540s, "not in the company of others, having no companions," from un- (1) "not" + past participle of accompany (v.). Musical sense "without instrumental accompaniment" is first recorded 1818.

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Definitions of unaccompanied
1
unaccompanied (adj.)
being without an escort;
unaccompanied (adj.)
playing or singing without accompaniment;
the soloist sang unaccompanied
unaccompanied (adj.)
(of a state or an event) taking place without something specified occurring at the same time;
a headache unaccompanied by other symptoms
2
unaccompanied (adv.)
without anybody else or anything else;
Synonyms: alone / solo
From wordnet.princeton.edu