n.
 (pl. solos)
    (pl. solos or soli)
 a piece of music, song, or dance for one performer.- an unaccompanied flight by a pilot.
 - 
(also solo whist)
 a card game resembling whist in which the players make bids and the highest bidder plays against the others. 
▸a bid by which a player undertakes to win five tricks in this game.
 - a motorbike without a sidecar.
 
adj.
 & 
adv.
 for or done by one person.
v.
 (soloes, soloing, soloed)
  - perform a solo.
 - fly an aircraft unaccompanied.
 
 
  Etymology
  C17: from Ital., from L. solus ‘alone’.