building block/ˈ·· ·/ n [C] 1 [usually plural 一般用复数] one of the pieces or parts that make it possible for something big or important to exist 成分,构成要素: Reading and writing are the building blocks of our education. 阅读和写作是构成教育的要素。 2 one of a set of CUBEs that young children play with (一块)积木