As a Noun:
1. The quality of having a surface which is entirely in one colour and has no pattern, design or writing. English = plainness, simplicity.
2. The quality of being very simple in style. English = plainness, simplicity.
3. A flavouring that comes from a plant and that can be put into ice cream and other sweet food. English = vanilla.
As a Verb or Adjective:
1. To have a surface which is entirely in one colour and has no pattern, design or writing. English = (be) plain, (be) undecorated.
2. To be very simple in style. English = (be) plain, (be) simple.
3. To be flavoured vanilla. English = (be) vanilla.