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A prefix is a type of affix that is attached to the beginning of a word or word base. Prefixes serve to create new words or modify the meaning of existing ones. For example, the prefix "un-" in "unwilling" changes the meaning of "willing" to its opposite. Other common prefixes include "re-" (meaning again) and "pre-" (meaning before). These word parts are crucial in understanding word formation and meaning in grammar.12

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