monarch
MON-ark · noun
Origin
Monarch comes from Middle French monarque, from Late Latin monarcha, from Ancient Greek monárkhēs (a variant of mónarkhos, 'sole ruler'), itself built from mónos, 'only,' plus arkhós, 'leader.'
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Journey
From Greek onward, the word has always named someone who rules alone.
Related words
It shares its Greek roots with other English words built from mono- ('only') and -arch ('leader' or 'ruler'), the same pieces that formed monárkhēs.