The Collaborative International Dictionary of English v.0.48:

Viola \Vi"o*la\, n. [L., a violet. See Violet.] (Bot.)
   A genus of polypetalous herbaceous plants, including all
   kinds of violets.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Viola \Vi"o*la\, n. [It. See Viol.] (Mus.)
   An instrument in form and use resembling the violin, but
   larger, and a fifth lower in compass.
   [1913 Webster]

   Viola da braccio [It., viol for the arm], the tenor viol,
      or viola, a fifth lower than the violin. Its part is
      written in the alto clef, hence it is sometimes called the
      alto.

   Viola da gamba [It., viol for the leg], an instrument
      resembling the viola, but larger, and held between the
      knees. It is now rarely used.

   Viola da spalla [It., viol for the shoulder], an instrument
      formerly used, resembling the viola, and intermediate in
      size between the viola and the viola da gamba.

   Viola di amore [It., viol of love: cf. F. viole d'amour], a
      viol, larger than the viola, having catgut strings upon,
      and brass or steel wires under, the keyboard. These,
      sounding sympathetically with the strings, yield a
      peculiarly soft and silvery sound. It is now seldom used.
      [1913 Webster]

WordNet (r) 3.0 (2006):

viola
    n 1: any of the numerous plants of the genus Viola
    2: large genus of flowering herbs of temperate regions [syn:
       Viola, genus Viola]
    3: a bowed stringed instrument slightly larger than a violin,
       tuned a fifth lower

Moby Thesaurus II by Grady Ward, 1.0:

97 Moby Thesaurus words for "viola":
   A string, Amati, Cremona, D string, E string, English horn,
   G string, Strad, Stradivari, Stradivarius, bass, bass viol,
   bassoon, block flute, bombard, bourdon, bow, bridge, bull fiddle,
   cello, claribel, clarinet, clarion, concert flute, contrabass,
   cornet, cornopean, cromorna, crowd, cymbel, diapason, double bass,
   dulciana, fiddle, fiddlebow, fiddlestick, fingerboard, flute stop,
   foundation stop, fourniture, gamba, gedeckt, gemshorn,
   harmonic flute, hybrid stop, kit, kit fiddle, kit violin,
   koppel flute, larigot, melodia, mixture, mutation stop, nazard,
   oboe, octave, organ stop, piccolo, plein jeu, posaune, principal,
   quint, quintaten, rank, ranket, reed stop, register, rohr flute,
   scroll, sesquialtera, shawm, soundboard, spitz flute, stop,
   stopped diapason, stopped flute, string, string diapason,
   string stop, tenor violin, tierce, tremolo, trombone, trumpet,
   tuning peg, twelfth, unda maris, vibrato, violin, violinette,
   violoncello, violoncello piccolo, violone, violotta, voix celeste,
   vox angelica, vox humana



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

VIOLA
       Vertically Intergrated Optical Testbed for Large Applications
(DFN)


The Free On-line Dictionary of Computing (30 December 2018):

Viola

   An experimental hypercard-like interpreted hypertext
   system by Pei Y. Wei of Berkeley.

   (1994-11-30)


U.S. Gazetteer Places (2000):

Viola, WI -- U.S. village in Wisconsin
   Population (2000):    667
   Housing Units (2000): 319
   Land area (2000):     1.053815 sq. miles (2.729368 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.053815 sq. miles (2.729368 sq. km)
   FIPS code:            82900
   Located within:       Wisconsin (WI), FIPS 55
   Location:             43.507552 N, 90.670178 W
   ZIP Codes (1990):     54664
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, WI
    Viola


U.S. Gazetteer Places (2000):

Viola, AR -- U.S. town in Arkansas
   Population (2000):    381
   Housing Units (2000): 181
   Land area (2000):     1.290812 sq. miles (3.343187 sq. km)
   Water area (2000):    0.003040 sq. miles (0.007873 sq. km)
   Total area (2000):    1.293852 sq. miles (3.351060 sq. km)
   FIPS code:            72140
   Located within:       Arkansas (AR), FIPS 05
   Location:             36.397319 N, 91.983233 W
   ZIP Codes (1990):     72583
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, AR
    Viola


U.S. Gazetteer Places (2000):

Viola, DE -- U.S. town in Delaware
   Population (2000):    156
   Housing Units (2000): 62
   Land area (2000):     0.177590 sq. miles (0.459956 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.177590 sq. miles (0.459956 sq. km)
   FIPS code:            74330
   Located within:       Delaware (DE), FIPS 10
   Location:             39.042224 N, 75.571595 W
   ZIP Codes (1990):     19979
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, DE
    Viola


U.S. Gazetteer Places (2000):

Viola, NY -- U.S. Census Designated Place in New York
   Population (2000):    5931
   Housing Units (2000): 1738
   Land area (2000):     2.705296 sq. miles (7.006683 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    2.705296 sq. miles (7.006683 sq. km)
   FIPS code:            77574
   Located within:       New York (NY), FIPS 36
   Location:             41.126295 N, 74.083285 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, NY
    Viola


U.S. Gazetteer Places (2000):

Viola, IL -- U.S. village in Illinois
   Population (2000):    956
   Housing Units (2000): 401
   Land area (2000):     0.827121 sq. miles (2.142234 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.827121 sq. miles (2.142234 sq. km)
   FIPS code:            78123
   Located within:       Illinois (IL), FIPS 17
   Location:             41.203833 N, 90.584620 W
   ZIP Codes (1990):     61486
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, IL
    Viola


U.S. Gazetteer Places (2000):

Viola, KS -- U.S. city in Kansas
   Population (2000):    211
   Housing Units (2000): 79
   Land area (2000):     0.158445 sq. miles (0.410370 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.158445 sq. miles (0.410370 sq. km)
   FIPS code:            74025
   Located within:       Kansas (KS), FIPS 20
   Location:             37.483526 N, 97.644918 W
   ZIP Codes (1990):     67149
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, KS
    Viola


U.S. Gazetteer Places (2000):

Viola, TN -- U.S. town in Tennessee
   Population (2000):    129
   Housing Units (2000): 59
   Land area (2000):     0.166247 sq. miles (0.430578 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.166247 sq. miles (0.430578 sq. km)
   FIPS code:            77400
   Located within:       Tennessee (TN), FIPS 47
   Location:             35.538085 N, 85.860606 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Viola, TN
    Viola