Learner's definition of CRACKER. [count]. 1. : a dry, thin baked food that is made of flour and water and is often eaten with cheese. — see also animal cracker, graham cracker, oyster cracker, soda cracker. a plate of cheese and crackers. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 2.ˈkraekɚ/. ˈkrækɚ. noun plural. Crackers'learner s definition OF. [cracker]. count. : 1 a, dry thin baked food that is made of flour and water and is often eaten with. — cheese see also animal, cracker graham, cracker oyster, cracker soda. cracker a plate of cheese and. crackers