Answer:
The modern definition of a short story is a fictional prose piece that is under 20,000 words
Step-by-step explanation:
The definition of a short story has changed through the years since at the beginning it was considered a fictional prose that a person can read in really short time without stopping but there where many elements that were not specified like the length of the short story, now it is considered a fictional prose that normally does not have more than 20,000 words.