This document defines and provides examples of prefixes and suffixes. Prefixes are added to the beginning of root words to modify their meaning, such as "un-" making "happy" into "unhappy". Suffixes are added to the end of root words and can change the class of the word or add further description, for example "-ful" turning "forget" into "forgetful". Tables list common prefixes and suffixes with their meanings. Rules for adding prefixes and suffixes are outlined, such as using a hyphen for prefixes added to nouns and retaining spelling. Overall, the document serves as a reference for how prefixes and suffixes modify word meanings.