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| in·dex num·ber (plural in·dex num·bers) |
noun |
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| Definition: |
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number indicating relative change: a number used to indicate the change in a value or quantity such as a price or unemployment, when compared with the level of that value or quantity at an earlier time. The base level is usually arbitrarily set at 100, and the increase or decrease in index numbers over time is often expressed as a percentage change.
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