What is a prefix?
Prefixes are a group of letters that change the meaning of a word when they are added to the start. Most prefixes mean a similar thing when they're added to different words.
- un usually means not. For example, unhappy, unlocked, unfair
- dis and mis usually have negative meanings. For example, disagree, disobey, misbehave, mislead
- re usually means again or back . For example, redo, reappear, redecorate
- sub usually means under . For example, subheading or submarine