Exact historical dictionary sense
Solo in Webster's 1913 dictionary
The 1913 record labels solo as noun. Its source-bounded etymology and selected historical definition appear below.
[It., from L. solus alone. See Sole, a.]
Cross-verified historical senseIn Webster's Revised Unabridged Dictionary (1913), "solo" is labeled noun. Its etymology is recorded as: "[It., from L. solus alone. See Sole, a.]" The selected historical definition says: "A tune, air, strain, or a whole piece, played by a single person on an instrument, or sung by a single voice."