What is Coffee ?
Coffee is (noun) 1. a bitter drink made from the seeds of a tropical plant Would you like a cup of coffee? I always take sugar with my coffee. The doctor told me to avoid tea and coffee. 2. a powder made from the seeds of the coffee plant Put two spoons of coffee into each cup. 3. a cup of coffee I’d like a white coffee, please. Three coffees and two teas, please. 4. a pale brown colour, like white coffee We have a coffee carpet in our sitting room. (NOTE: usually no plural; coffees means cups of coffee)
source: Easier English, Student Dictionary Upper Intermediate Level