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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.

The prefix un- usually means not. For example:

• unhappy
• unlocked
• unfair

The prefixes dis- and mis- usually have negative meanings. For example:

• disagree
• disobey
• misbehave

The prefix re- usually means again or back. For example:

• redo
• reappear
• redecorate

The prefix sub- usually means under. For example:

• subheading
• submarine

Watch: How to use prefixes

Fudge, Pudge and Grudge learn about what a prefix is.

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