Sentence:  To be eligible to borrow from a Bank for Cooperatives , a cooperative must be an <WSD>association</WSD> in which farmers act together in processing and marketing farm products , purchasing farm supplies , or furnishing farm business services , and must meet the requirements set forth in the Farm Credit Act of 1933 , as amended . 
Meaning of the word marked with <WSD> tags:  a formal organization of people or groups of people