Meaning

1. to add (to take the sum)
2. to add (to join something additional to something else)
3. to give; to add (to cause a given trait to become more intense)
4. to add (to say something additional)
5. to give
6. to supply with; to deliver; to hand
7. to cause (to be the causer of the existence of an immaterial good)
8. to add oneself (to place oneself in a list)
9. to add up to (to equal a summed value)