What does the word "copious" refer to?

The word "copious" refers to something that is abundant and plentiful, often used to describe a large quantity of something. It conveys the idea of having a lot of something, such as copious notes taken during a lecture, which indicates that there is an overflowing amount of information recorded. This aligns with the definition you selected, highlighting the richness and generosity of presence in quantity. Understanding this term can enhance vocabulary in contexts where the magnitude or richness of substances or information is being described.