As a Noun:
1. A colour that is between red and blue; a reddish-blue colour. English = purple.
2. A colour that is between red and blue, but with more blue than red; a bluish purple. English = violet.
3. A colour that is between red and blue, but which is more pale (ie lighter or whiter) than purple; a light purple. English = mauve.
As a Verb or Adjective:
1. To be reddish-blue in colour. English = (be) purple.
2. To be bluish purple in colour. English = (be) violet.
3. To be light purple in colour. English = (be) mauve.