ラテン語の solo, soloist, soloist から。ラテン語の solus, alone が語源で、語源的には sole と同じ。
英語の語源
solo
solo: see sole
solo (n.)
1690s, "piece of music for one voice or instrument," from Italian solo, literally "alone," from Latin solus "alone" (see sole (adj.)). As an adjective in English from 1712, originally in the non-musical sense of "alone, unassisted;" in reference to aircraft flying from 1909. The verb is first attested 1858 in the musical sense, 1886 in a non-musical sense. Related: Soloed; soloing.
例文
1. The piece segues into his solo with the strings.
曲の終わりに続くのが彼のストリングス?ソロだ。
2.He has acquired a reputation as this country 's premier solo violinist.
彼はすでに同国の首席バイオリニストの名誉を勝ち取った。
3.She went solo backpacking for eight months in the Australian outback.