The term "small avocado" typically refers to a standard-sized avocado, which is around 3 inches in diameter and weighs between 8 to 10 ounces. This size is commonly available in grocery stores and is suitable for most recipes that call for avocado. However, there are also larger varieties of avocados that can be up to 6 inches in diameter or even bigger, which may be referred to as "large" or "extra-large."