Definition of "Solo" :

noun: a flight in which the aircraft pilot is unaccompanied

noun: any activity that is performed alone without assistance

noun: a musical composition for one voice or instrument (with or without accompaniment)

verb: perform a piece written for a single instrument

verb: fly alone, without a co-pilot or passengers

adjective: composed or performed by a single voice or instrument

"A passage for solo clarinet."

adverb: without anybody else or anything else

"He flew solo."