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upgrade To replace existing software or hardware with a newer version. See upgradable, update, critical update, bugrade and About this encyclopedia.upgrade 1. US and Canadian an upward slope 2. US and Canadian going or sloping upwards upgrade [¦əp¦grād] (mining engineering) To increase the commercial value of a coal or mineral product by appropriate treatment. To increase the quality rating of diamonds beyond or above the rating implied by their particular classification.
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