What is the meaning of vanilla?

noun

• Any of numerous climbing plants of the genus Vanilla having fleshy leaves and clusters of large waxy highly fragrant white or green or topaz flowers.
• A flavoring prepared from vanilla beans macerated in alcohol (or imitating vanilla beans.
  • synonyms: vanilla extract
• A distinctive fragrant flavor characteristic of vanilla beans.

adjective

• Flavored with vanilla extract.
  • usage: "he liked vanilla ice cream"
• Plain and without any extras or adornments.
  • usage: "the most common type of bond is the straight or plain vanilla bond"; "the basic car is known as the vanilla version"