# 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: 10 Search : degree
 degree   درجه   darajé (#)Fr.: degré   1) Subdivision of an interval in a scale of measurement. 2) Geometry: Measure of angle, the 360th part of a circle. 3) Math.: Rank of an equation or expression as determined by the sum of the exponents of the variables.From O.Fr. degré, from V.L. *degradus "a step," from L.L. degredare, from L. → de- "down" + gradus "step."Darajé, from Ar. darajat "step, ladder." degree of coherence   درجه‌ی ِ همدوسی   dareje-ye hamdusiFr.: degré de cohérence   The extent of → coherence of an → electromagnetic wave, as indicated by a → dimensionless number. Since interference takes place when waves are → coherent, using a → Young's experiment, the degree of coherence is measured from the → fringe  → visibility, V. It is defined as the ratio V = (Imax - Imin) / (Imax + Imin), where Imax is the intensity at a maximum of the → interference pattern, and Imin is the intensity at a minimum of the interference pattern. The electromagnetic wave is considered to be highly coherent when the degree of coherence is about 1, incoherent for nearly zero values, and partially coherent for values between 0 and 1.→ degree; → coherence. degree of freedom   درجه‌ی ِ آزادی   daraje-ye âzâdi (#)Fr.: degré de liberté   Of a → mechanical system, the number of → independent variables needed to describe its configuration.→ degree; → freedom. degree of ionization   درجه‌ی ِ یونش   daraje-ye yoneš (#)Fr.: degré d'ionisation   The number of electrons a neutral atom has lost in an ionizing physical process (radiation, shock, collision). In spectroscopy, the degree of ionization is indicated by a Roman numeral following the symbol for the element. A neutral atom is indicated by the Roman numeral I, a singly ionized atom, one which has lost one electron, is indicated by II, and so on. Thus O VI indicates an oxygen atom which has lost five electrons.→ degree; → ionization. degree of polarization   درجه‌ی ِ قطبش   daraje-ye qotbešFr.: degré de polarisation   The ratio of the intensity of polarized portion of light to the total intensity at a point in the beam.→ degree; → polarization. degree of stability   درجه‌ی ِ پایداری   daraje-ye pâydâriFr.: degré de stabilité   Statics: The → energy that must be expended to permanently disturb a specific state of → equilibrium of a body.→ degree; → stability. degree of vertex   درجه‌ی ِ تارک   daraje-ye târakFr.: degré de vertex   The → number of → edges incident on the → vertex.→ degree; → vertex. first degree equation   هموگش ِ درجه‌ی ِ یکم   hamugeš-e daraje-ye yekomFr.: équiation du premier degré   A equation in which the highest → exponent of the → variable is 1. Same as → linear equation.→ first; → degree; → equation. polarization degree   درجه‌ی ِ قطبش   daraje-ye qotbeš (#)Fr.: degré de polarisation   → polarization; → degree. square degree   درجه‌ی ِ چاروش   daraje-ye cârušFr.: degré carré   A solid angle whose cone is a tetrahedral pyramid with an angle between its edges equal to 1°. 1 square degree = 3.046 x 10-4 sr = 2.424 x 10-5 solid angle of a complete sphere.→ square; → degree.