In Spain, the thing to ask for in a bar if you want an (almost) Italian-style espresso coffee. Contrast café con leche.
In
cycling, a machine for one rider, by contrast with a
tandem,
triplet, etc. - "The
End to End record for solo
tricyle is held by Ralph Dadswell in 2 days, 5 hours and 29 minutes." - yes, there is a
tandem tricyle record too ...
In
jazz and popular music, part of a piece performed by a single instrumentalist, generally a display of an excess of technical proficiency, while the rest of the band stand around looking bored or go to the bar. In
orchestral music, a passage played by a single player - generally the
leader or
principal - rather than their whole
section; there is no implication that the rest of the orchestra shuts up while this is going on.