A prefix is a word part (morpheme) placed in front of a base word to form a new word. Prefixes change the semantic meaning of the affected word. For example, if we add the prefix un- to the base word ‘kind’, we will form the negative ‘unkind’. Here are more examples of prefixes: non (existent), il (legal), im (patient), un(sure), dis(solve), ir(responsible), mis(understand), in(humane), over (cooked), and re(done).
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