The word "redundant" refers to something that is no longer needed or useful because it is repetitive or excessive. It often describes elements that are superfluous or that add no additional value. For example, if a piece of writing contains repeated ideas or phrases, those parts can be considered redundant.
The term "redundant" comes from the Latin word "redundans," which means "overflowing." It is formed from the prefix "re-" (meaning "back" or "again") and "undare" (meaning "to wave" or "to flow"). Thus, it conveys the idea of something that overflows or is extra.