What is the meaning of the word "kiss"?

Definitions:

a cookie made of egg whites and sugar noun
- Let's make some kisses for the kids!
a light glancing touch noun
- Their arms kissed momentarily at the dinner table .
any of several bite-sized candies noun
- Kisses are a popular Halloween treat.
the act of caressing with the lips, or an instance thereof noun
- It is not uncommon to greet people with a kiss on the cheek in Europe.
touch lightly or gently verb
- The eight ball kissed the corner pocket before bouncing out.
touch with the lips or press the lips against someone's mouth or other body part as an expression of love, greeting, and so on verb
- The newly married couple kissed in front of their guests.