A system of government or rule by ten leaders, or rule over a territory divided into ten units.
From Greek 'deca-' (ten) + 'archia' (rule or government). This noun combines the ten prefix with the suffix for government systems, mirroring words like 'monarchy' and 'anarchy' to describe rule by or over ten.
While 'decadarchy' rarely describes modern governments, it perfectly describes how the ancient Greeks divided territories militarily—and interestingly, many organizational charts still show ten-person divisions, making the concept oddly relevant to modern management.
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