A ruler or leader of a group of ten people or a territory containing ten units.
From Greek 'deca-' (ten) + 'archos' (ruler or leader). This term combines the number ten with the Greek word for 'ruler,' historically referring to military or administrative leaders commanding units of ten.
In ancient Rome and Greece, a decadarch was the lowest-ranking commander—in charge of just ten soldiers—similar to how a modern sergeant might lead a squad; it's where hierarchical organization literally started with the number ten.
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