1. A discrepancy between a computed, observed, or measured value or condition and the true, specified, or theoretically correct value or condition. 
   一种经计算、观察或测量而得到的值或状态同真实的、指定的或理论上正确的值或状态之间的差别。
2. The difference between a computed or measured value and a true or theoretically correct value. 
   误差计算值或测量值与理论上正确值之差
3. the difference between an observed value and the expected value of a variable or function. 
   一个受控变量的实际值和对应于给定的期望值之差。
4. The estimated amount or percentage by which an observed or calculated value may differ from the true value. 
   偏差，误差测算价值相差于实际价值的大概数量或百分点
5. (economics) being value measured in terms of purchasing power. 
   （经）根据购买力进行价值估量。

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