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[syn: alone, solo, unaccompanied]
The Collaborative International Dictionary of English v.0.48:
Solo \So"lo\ (s[=o]"l[-o]), n.; pl. E. Solos (s[=o]"l[=o]z),
   It. Soli. [It., from L. solus alone. See Sole, a.] (Mus.)
   A tune, air, strain, or a whole piece, played by a single
   person on an instrument, or sung by a single voice.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Solo \So"lo\, a. (Music)
   Performing, or performed, alone; uncombined, except with
   subordinate parts, voices, or instruments; not concerted.
   [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
solo
    adv 1: without anybody else or anything else; "the child stayed
           home alone"; "the pillar stood alone, supporting
           nothing"; "he flew solo" [syn: alone, solo,
           unaccompanied]
    adj 1: composed or performed by a single voice or instrument; "a
           passage for solo clarinet"
    n 1: any activity that is performed alone without assistance
    2: a musical composition for one voice or instrument (with or
       without accompaniment)
    3: a flight in which the aircraft pilot is unaccompanied
    v 1: fly alone, without a co-pilot or passengers
    2: perform a piece written for a single instrument
Moby Thesaurus II by Grady Ward, 1.0:
103 Moby Thesaurus words for "solo":
   air, airlift, alienated, alone, aloof, apart, aria, aria buffa,
   aria cantabile, aria da capo, aria da chiesa, aria di bravura,
   aria di coloratura, aria fugata, aria parlante, arietta, arioso,
   aside, barnstorm, bravura, cantabile, canto, cantus, choir,
   claviature, coloratura, companionless, console, control, copilot,
   descant, detached, drive, echo, eighty-eight, fingerboard, flight,
   fly, friendless, great, homeless, hop, individual, insular,
   isolated, ivories, jump, keyboard, keys, kithless, lay, line, lone,
   lonely, lonesome, manipulate, manual, measure, melodia,
   melodic line, melody, monodrama, monologue, monology, note,
   organ manual, pedals, peel off, piano keys, pilot, recitative,
   refrain, removed, rootless, run, separate, separated,
   single-handed, singular, sole, soliloquy, solitary, solo part,
   song, soprano part, strain, swell, test flight, treble, trip, tune,
   unabetted, unaccompanied, unaided, unassisted, unattended,
   unescorted, unexampled, unique, unrepeatable, unseconded,
   unsupported, withdrawn
The Free On-line Dictionary of Computing (30 December 2018):
SOLO
   [SOL (Semantic Operating Language) + LOGO].  A variant of
   LOGO with primitives for dealing with semantic networks
   and pattern matching rather than lists.
   ["A User-Friendly Software Environment for the Novice
   Programmer", M. Eisenstadt , CACM
   27(12):1056-1064 (1983)].