Building Block Definition

noun
A fundamental element, fact, idea, etc. upon which something is built, developed, maintained, etc.
Webster's New World
A block used as a building material, especially a cinder block.
American Heritage
A small wooden or plastic cube used as a building toy.
American Heritage
A basic element or part of something.
Amino acids are the building blocks of proteins.
American Heritage

Other Word Forms of Building Block

Noun

Singular:
building block

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building block