The basic part of a word that is also the source its essential meaning called a?

The basic part of a word that is also the source of its essential meaning is called a root.

Here's why:

* Root: The core element of a word that carries its fundamental meaning. It's the building block from which other words can be derived.

* Essential Meaning: The core concept or idea conveyed by the word.

For example:

* "scrib" is the root of words like "describe," "subscribe," and "inscription." It means "to write."

* "graph" is the root of words like "autograph," "biography," and "graphic." It means "to write."

Let me know if you'd like to explore more about word roots!