adj.
1.composed or performed by a single voice or instrument solo adv.
1.without anybody else solo n.
1.any activity that is performed alone without assistance
2.a musical composition for one voice or instrument (with or without accompaniment)
3.a flight in which the aircraft pilot is unaccompanied solo v.
1.fly alone, without a co-pilot or passengers
2.perform a piece written for a single instrument