What word denotes an abundant supply or quantity of something?

The term that indicates an abundant supply or quantity of something is "copious." This word is often used to describe a large amount of resources, such as information, quantities of food, or substantial written material. It conveys the sense of excess or abundance in a way that emphasizes the plentiful nature of what is being discussed.

In contrast, the other terms suggest limited quantities. "Scarce" refers to something that is in short supply, "minimal" indicates the least possible amount, and "rare" refers to something that is not common or occurs infrequently. Thus, "copious" is the most fitting word that conveys a sense of abundance and plentifulness.