- Whosoever is defined as whoever.
An example of whosoever used as a pronoun is in the sentence, "Whosoever wants to have dessert needs to finish dinner immediately," which means that anyone who wants dessert has to finish dinner immediately.
whosoever definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
whoever: an emphatic form
whosoever definition by American Heritage Dictionary