What is the definition of prefix sub?

The prefix "sub-" generally means "below," "under," "less than," or "inferior to." It comes from Latin and is often used to indicate a position or rank that is lower or smaller than something else.

Here are some examples of how "sub-" is used in words:

* Submarine: A vessel that operates underwater.

* Subordinate: Someone who is lower in rank or authority.

* Subspecies: A group of organisms that are distinct from the main species but still closely related.

* Subtropical: A climate zone that is located between the tropics and temperate zones.

* Subtotal: A sum that excludes certain items, like tax or shipping.

In some cases, "sub-" can also have a more specific meaning. For instance:

* Substitute: Someone or something that takes the place of another.

* Subdivide: To divide something into smaller parts.

So, the meaning of "sub-" can vary slightly depending on the word it is attached to. However, the general idea is that it implies a position or state that is lower, smaller, or inferior to something else.