What does monarch mean in prefix?

The word "monarch" itself is not a prefix, it's a noun meaning "a sovereign head of state, especially a king or queen."

However, "monarch" does have a root word that can be used as a prefix: "mono-".

"Mono-" means "one" or "single."

Here are some examples of words using the prefix "mono-":

* Monotone: A single, unchanging tone of voice.

* Monopoly: Exclusive control of a commodity or service.

* Monorail: A railway with a single rail.

* Monocle: A single, eyeglass lens.

* Monotheism: The belief in only one God.