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In language, a morpheme is considered to be the smallest grammatical unit. When a morpheme is used in front of the stem of a word it is called a prefix. The prefix can alter the meaning of the word. For example the word "unhappy" uses the prefix un- which means "not" therefore the word means "not happy".

Other examples of words with prefixes include disagree, inactive, prearrange and disappear.

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12y ago

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