1) spoken or performed without practicing or preparing (adlib)

2) the keeping or observing of a law, custom, festival etc; an act performed as part of a ceremony or as a sign of respect or worship (observance)

3) a story (to be) performed on a stage, on TV or radio; to do (something) to pass time pleasantly, as children do (play)

4) alone; by one person; a piece of music (to be) performed by one person (solo)

5) without a companion; performed without an accompaniment (unaccompanied)