Okay kiddo, let's first start with what "adjectivals" and "demonyms" mean. Adjectivals are describing words that tell us more about a noun, like "red apple" where "red" is the adjectival. Demonyms are words used to describe people or things from a specific place, like "New Yorker" for someone from New York.
Now, let's talk about regions in Greco-Roman times, which means the time when Ancient Greeks and Romans lived. They lived in different regions, which had their own adjectivals and demonyms.
For example, Greece is a region that had adjectivals like "Hellenic" which meant related to Greece, and demonyms like "Athenian" which meant someone from Athens. Rome is another region that had adjectivals like "Roman" which meant related to Rome, and demonyms like "Romanian" which is not the same as modern-day Romanian.
These adjectivals and demonyms helped people identify where something or someone came from, which was important for trade, travel, and communication. So, even though these words might sound fancy, they were actually a part of everyday life for people living in ancient Greece and Rome.