Real Dictionary

viola
countable noun: Violas are small plants with white, yellow, or purple flowers.
variable noun: A viola is a musical instrument with four strings that is played with a bow. It is like a violin, but is slightly larger and can play lower notes.

Viola in American English
a feminine name: dim. Vi
noun: a female given name

viola in American English 1
a stringed instrument of the violin family, slightly larger than a violin and tuned a fifth lower
noun: a four-stringed musical instrument of the violin family, slightly larger than the violin; a tenor or alto violin

viola in American English 2
a violet; esp., any of various violets developed from a pansy (Viola cornuta), grown as garden plants
noun: any plant of the genus Viola, esp. a cultivated variety

viola in British English 1
noun: a bowed stringed instrument, the alto of the violin family; held beneath the chin when played. It is pitched and tuned an octave above the cello

viola in British English 2
noun: any temperate perennial herbaceous plant of the violaceous genus Viola, the flowers of which have showy irregular petals, white, yellow, blue, or mauve in colour