Prefixes are added to the beginning of a word to make a new word with a different meaning. For example, the word prefix itself begins with the prefix pre-, which generally means before.
Prefixes can create a new word opposite in meaning to the word the prefix is attached to. For example, adding the prefix im- to the base word possible creates a new word, impossible, which means not possible. Prefixes can also make a word negative or express relations of time, place, or manner.
Here are the most common prefixes in English, with their basic meaning and some examples.
