deviation meaning

[ ˌdi:vi'eiʃən ] Pronunciation:   "deviation" in a sentence
Noun: deviation  `deevee'eyshun
  1. A variation that deviates from the standard or norm
    "the deviation from the mean"
    - divergence, departure, difference 
  2. The difference between an observed value and the expected value of a variable or function 
  3. The error of a compass due to local magnetic disturbances 
  4. Deviate behaviour
    - deviance, deviancy 
  5. A turning aside (of your course or attention or concern)
    - diversion, digression, deflection, deflexion [Brit], divagation

Derived forms: deviations

See also: deviate

Type of: abnormality, erroneousness, error, fluctuation, irregularity, statistic, turn, turning, variation

Encyclopedia: Deviation

noun [C,U]



a difference from what is normal, expected or required:

The loss represents a 20% deviation from our financial targets.

Any deviation from company policy is unacceptable.

2 (Technical )

the amount by which a single measurement is different from the average

(*) 1. The distance by which a point of impact or burst misses the target.
See also circular error probable; delivery error; dispersion error; horizontal error.
2. The angular difference between magnetic and compass headings.

1. In a frequency-modulated (FM) radio signal, the instantaneous amount of carrier frequency shift away from the unmodulated frequency. It is usually expressed in kilohertz; directly proportional to the amplitude of the modulating signal, up to a certain maximum that depends on the bandwidth allowed.
2. The maximum instantaneous carrier frequency shift in a FM signal.
3. The extent or amount by which a quantity drifts from its proper value.

The difference between the actual value of a controlled variable and the desired value corresponding to the set point.


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  1. the deviations should not exceed 25 cal.
  2. deviation from this rule are very rare.
  3. the deviations are thus only apparent.
  4. ray a is reflected and transmitted without deviation.
  5. time deviation due to propagation delay can be tolerated.

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