What does the root word pleas mean?

The root word "pleas" is actually a plural form of the noun "plea."

Plea has several meanings, but the most relevant to the root word "pleas" are:

* A request, especially for something that is needed or wanted. For example, "He made a plea for help."

* A formal statement made in a court of law, especially by a defendant. For example, "The defendant entered a plea of not guilty."

So, "pleas" would simply mean multiple requests or formal statements made in a court of law.