Subdivide
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To divide the parts of (anything) into more parts; to part intosmaller divisions; to divide again, as what has already been divided.The progenies of Cham and Japhet swarmed into colonies, and thosecolonies were subdivided into many others. Dryden.
Subdivide meaning & definition 1 of Subdivide.
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Divide (something that has already been divided or that is a separate unit)
Subdivide meaning & definition 2 of Subdivide.