1. in a way that is unnecessary because something else serves the same purpose
2. in a way that uses more words than needed to express an idea

Examples

• The backup system operates redundantly to ensure safety.
• She explained the concept redundantly, repeating the same points multiple times.
• The two departments were working redundantly on the same project.
• He redundantly stated his name twice in the introduction.
• The safety features function redundantly to prevent accidents.
• The writer redundantly used several synonyms to make the same point.