The word "staple" has a couple of meanings depending on the context in which it is used. Primarily, it refers to a basic or essential item, particularly in the context of food or commodities. For example, rice and bread are considered staples in many diets because they are fundamental sources of nutrition. Additionally, "staple" can refer to an item that is a standard or typical element of something, such as staple products in retail.
The word "staple" originates from the Old English term "stapol," which means a post or pillar. Over time, it evolved to denote something that acts as a support or foundation, eventually leading to its modern meanings related to essential items or commodities.