The quality or state of having many branches, or the degree to which something branches out.
From 'branchy' (adjective meaning full of branches) + '-ness' (English suffix making nouns). The root 'branch' comes from Old French 'branche' meaning an arm-like division of a tree.
Rivers and trees show the same branching patterns as blood vessels and lightning—it's called fractal geometry, and branchiness is nature's way of maximizing reach with minimum material.
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