Noun
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a flight in which the aircraft pilot is unaccompanied
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a musical composition for one voice or instrument (with or without accompaniment)
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any activity that is performed alone without assistance
Verb
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perform a piece written for a single instrument
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fly alone, without a co-pilot or passengers
Adjective
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composed or performed by a single voice or instrument
"a passage for solo clarinet"
Adverb
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without anybody else or anything else
"the child stayed home alone"
"the pillar stood alone, supporting nothing"
"he flew solo"