Based on your knowledge of Greek roots what words most likely means ruled by a single individual?

Here's how to break down the word using Greek roots to find the word that means "ruled by a single individual":

* "Mono" in Greek means "one" or "single."

* "Arch" in Greek means "ruler" or "chief."

Putting these together, we get "monarch", which refers to a single ruler, such as a king or queen.