Wordnet 3.0
NOUN (1)
1.
a musician who performs a solo;
The Collaborative International Dictionary of English v.0.48:
Soloist \So"lo*ist\, n. (Mus.)
One who sings or plays a solo.
[1913 Webster]
WordNet (r) 3.0 (2006):
soloist
n 1: a musician who performs a solo