sōlo, āvi, ātum, 1, v. a. [solus],
to make lonely or desolate; to lay waste , desolate (only a few times in the post-Aug. poets): urbes populis, Stat. Th. 4, 36: domos, id. ib. 5, 149; Sen. Oedip. 4.
·adj A tune, air, strain, or a whole piece, played by a single person on an instrument, or sung by a...
Webster's Dictionary of the English Language