What is the meaning of the word "tea"?

Definitions:

a beverage made by steeping tea leaves in water noun
- iced tea is a cooling drink
a light midafternoon meal of tea and sandwiches or cakes noun
- An Englishman would interrupt a war to have afternoon tea.
a reception or party at which tea is served noun
- we met at the Dean's tea for newcomers
a tropical evergreen shrub or small tree extensively cultivated in e.g. China and Japan and India noun
- source of tea leaves
dried leaves of the tea shrub noun
- used to make tea