Prefixes Worksheet Directions: Fill out the meaning of each prefix. Then, come up with your own key word that uses that prefix that is not given in the study sheet. If there is more than one prefix listed that corresponds to a single meaning, give a key word for each prefix. For example, both “en-” and “em-” mean “cause to,” so the key words could be “encode” and “embrace.” Prefix AntiBiCoDeDi-, DyDisEn-, EmExForeIn, Im-, Il-, IrInterMidMisNonOverPreReSemiSubSuperTransUnUnder- Meaning Key Word(s)