Answer: The meaning of the Greek root "arch" is "ruler" or "chief".
Step-by-step explanation: The root word "arch" comes from Greek and it is used to refer to someone that is in a high position and has authority over others, that is to say that it means "ruler" or "chief". Furthermore, "arch" is mainly used together with nouns in order to form other words. For example, the Greek root "arch" is part of the words "archbishop" and "archpriest". Moreover, it is also included in "monarch", which means "one single ruler".