A prefix is a set of letters added to the beginning of a word, that changes what it means.  For example, the prefix un- usually changes the original word to the opposite meaning (happy/unhappy).

There are many common prefixes.  This doesn’t work for all words, but if you learn how these prefixes are used, you can increase your vocabulary more quickly.  (unlucky; unzip; uncut; unopened; unwrap; unknown; unlock; etc.)

Here are some of the most common prefixes:

Finally, here’s a larger list of 50 common prefixes.

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