# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12 Search : variance
 autocovariance   خود-هم‌ورتایی   xod-hamvartâyiFr.: autocovariance   The → covariance of a → time series overt time.→ auto-; → covariance. autocovariance function   کریای ِ خود-هم‌ورتایی   karyâ-ye xod-hamvartâyiFr.: fonction d'autocovariance   The autocovariance function (ACF) is defined as the sequence of covariances of a stationary process. A mathematical function that expresses the autocovariance of a series in terms of the interval of separation. charge invariance   ناورتایی ِ بار   nâvartâyi-ye bârFr.: invariance de charge   The → electric charge carried by an object is independent of the → velocity of the object with respect to the → observer. In other words, the charge is the same in any → frame of reference.→ charge; → invariance. covariance   هم‌ورتایی   hamvartâyiFr.: covariance   In statistics, a measure of linear dependence. For two random variables X and Y with expectations mx and my, the covariance is E{(X - mx)(Y - my)}.From co-, → com-, + → variance.From ham-, → com-, + vartâyi, → variance. Galilean invariance   ناورتایی ِ گالیله‌ای   nâvartâyi-ye Gâlile-yiFr.: invariance galiléenne   Same as → Galilean relativity.→ Galilean; → invariance. gauge invariance   ناورتایی ِ گز   nâvartâyi-ye gazFr.: invariance de jauge   The invariance of any field theory under gauge transformation.→ gauge; → invariance. invariance   ناورتایی   nâvartâyiFr.: invariance   Any property of a physical law or quantity that is unchanged after the application of certain classes of transformations.Invariance; noun of → invariant. local Lorentz invariance   ناورتایی ِ لورنتز ِ محلی   nâvartâyi-ye Lorentz-e mahaliFr.: invariance de Lorentz locale   → local; → Lorentz; → invariance. local position invariance   ناورتایی ِ نهش ِ محلی   nâvartâyi-ye neheš-e mahaliFr.: invariance de position locale   → local; → position; → invariance. Lorentz invariance   ناورتایی ِ لورنتز   nâvartâyi-ye LorentzFr.: invariance de Lorentz   Of a physical law, invariance with respect to a → Lorentz transformation.→ Lorentz; → invariance. principle of covariance   پَروز ِ هم‌ورتایی   parvaz-e hamvartâyiFr.: principe de covariance   In special relativity, the principle that the laws of physics take the same mathematical form in all inertial frames of reference.→ principle; → covariance. variance   ورتایی   vartâyiFr.: variance   A measure of the scatter of the values of a random variable (X) about its mean (μ). Var(X) = E(X -μ)2. The positive square root of the variance is called the → standard deviation.M.E., from O.Fr. variance, from L. variantia, from variare "to change," → vary.Vartâyi quality noun from vartâ agent noun from vartidan, → vary.