What is the meaning of word ques in such as inquisitive and inquire?

The word "ques" is actually a root word, not a standalone word. It comes from the Latin word "quaerere" which means "to seek" or "to ask".

Here's how it works in the words you mentioned:

* Inquisitive: This word combines the root "ques" with the prefix "in-" (meaning "into" or "within") and the suffix "-itive" (meaning "tending to"). Therefore, inquisitive means "tending to ask questions" or "eager to learn".

* Inquire: This word combines the root "ques" with the prefix "in-" (meaning "into" or "within") and the suffix "-ire" (meaning "to make"). Therefore, inquire means "to ask a question" or "to seek information".

Essentially, the root "ques" signifies the act of seeking or questioning, which is the core meaning of both inquisitive and inquire.