What is the meaning of solo?

noun

• Any activity that is performed alone without assistance.
• A musical composition for one voice or instrument (with or without accompaniment. )
• A flight in which the aircraft pilot is unaccompanied.

verb

• Fly alone, without a co-pilot or passengers.
• Perform a piece written for a single instrument.

adjective

• Composed or performed by a single voice or instrument.
  • usage: "a passage for solo clarinet"

adverb

• Without anybody else or anything else.
  • usage: "the child stayed home alone"; "the pillar stood alone, supporting nothing"; "he flew solo"
  • synonyms: alone, unaccompanied