告诉我 Webster's Dictionary 对 imagination 的定义。注意，你的回答必须是以标记语言的形式给出，下面给出xml格式.']
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<definition>
    <term>imagination</term>
    <meaning>The act or power of forming a mental image of something not present to the senses or never before wholly perceived in reality.</meaning>
</definition>
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