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| build·ing block (plural build·ing blocks) |
noun |
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1. child's toy block: one of a set of children's wooden or plastic blocks
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2. component: an element or component regarded as contributing to the growth of an organization, plan, or system
 discovered clumps of dark matter that were the building blocks of today's galaxies
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3. brick-shaped construction block: a large block of concrete or similar hard material, used for building houses and other large structures
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