What does the root word mega mean?

The root word "mega" comes from the Greek word "μέγας" (megas), which means "great," "large," or "powerful."

It's often used as a prefix in English words to indicate something large or enormous, like:

* Megaphone: A device for amplifying sound.

* Megastar: A very famous and successful person.

* Megaton: A unit of explosive power equal to one million tons of TNT.

So, whenever you see "mega" in a word, it usually tells you that something is big or significant!