Read the meanings of the word fold, then read the sentence. Definition 1. n., a crease in fabric or a piece of paper Definition 2. v., to bend Definition 3. n., a group of people with common beliefs Definition 4. v., to incorporate one food ingredient into another What is the meaning of fold as it is used in this sentence? When making cake batter, it is important to fold the flour into the butter before adding the rest of the ingredients.