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

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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 stationary point   نقطه‌ی ِ ایست‌ور   noqte-ye istvarFr.: point critique, ~ stationnaire   1) Math.: For a → function y = f(x), a point at which the → tangent to the graph is horizontal. In other words, a point where the → slope is zero: dy/dx = 0. 2) Of a planet, the position at which the rate of change of its apparent → right ascension is momentarily zero.→ stationary; → point. stationary satellite   ماهواره‌ی ِ ایست‌ور   mâhvâre-ye istvarFr.: satellite stationnaire   An artificial satellite in a synchronous orbit. → geostationary orbit→ stationary; → satellite. stationary time series   سری ِ زمانی ِ ایست‌ور   seri-ye zamâni-ye istvarFr.: série temporelle stationnaire   A → time series if it obeys the following criteria: 1) Constant → mean over time (t). 2) Constant → variance for all t, and 3) The → autocovariance function between Xt1 and Xt2 only depends on the interval t1 and t2.→ stationary; → time; → series. stationary wave   موج ِ ایست‌ور   mowj-e istvarFr.: onde stationnaire   Same as → standing wave.→ stationary; → wave. statistical   آماری   âmâri (#)Fr.: statistique   Of, pertaining to, consisting of, or based on → statistics.Statistic, from → statistics + → -al. statistical analysis   آنالس ِ آماری   ânâlas-e âmâriFr.: analyse statistique   The process of collecting, manipulating, analyzing, and interpreting quantitative data to uncover underlying causes, patterns, and relationships between variables.→ statistical; → analysis. statistical equilibrium   ترازمندی ِ آماری   tarâzmandi-ye âmâriFr.: équilibre statistique   A state in which the average density of atoms per cubic centimeter in any atomic state does not change with time and in which, statistically, energy is equally divided among all degrees of freedom if classical concepts prevail. statistical hypothesis   انگاره‌ی ِ آماری   engâre-ye âmâriFr.: hypothèse statistique   An assumed statement about the way a → random variable is distributed. A statistical hypothesis generally specifies the form of the → probability distribution or the values of the parameters of the distribution. The statement may be true or false. See also → null hypothesis. statistical hypothesis testing   آزمون ِ انگاره‌ی ِ آماری   âzmun-e engâre-ye âmâriFr.: test d'hypothèse statistique   A method of making decision between rejecting or not rejecting a → null hypothesis on the basis of a set of observations.→ statistical; → hypothesis; → test. statistical inference   دربرد ِ آماری   darbord-e âmâriFr.: inférence statistique   The process of inferring certain facts about a → statistical population from results found in a → sample.→ statistical; → inference. statistical law   قانون ِ آماری   qânun-e âmâri (#)Fr.: loi statistique   A law that governs the behavior of a system consisting of a large number of particles and which differs from the laws obeyed by each of the particles making up the macroscopic system. See also → dynamical law.→ statistical; → law. statistical mechanics   مکانیک ِ آماری   mekânik-e âmâri (#)Fr.: mécanique statistique   → statistical; → mechanics. statistical parallax   دیدگشت ِ آماری   didgašt-e âmâriFr.: parallaxe statistique   The mean parallax of a group of stars that are all at approximately the same distance, as determined from their radial velocities and proper motions.→ statistical; → parallax. statistical physics   فیزیک ِ آماری   fizik-e âmâri (#)Fr.: physique statistique   The branch of physics that applies methods of → probability theory and → statistics to the behavior of large numbers of microscopic particles (such as molecules, atoms, or subatomic particles) in order to explain and predict the overall properties of the system composed of such particles.→ statistical; → physics. statistical population   پرینش ِ آماری   porineš-e âmâriFr.: population statistique   Any collection of individuals or items from which → samples are drawn. See also → finite population, → infinite population. statistical thermodynamics   گرماتوانیک ِ آماری   garmâtavânik-e âmâriFr.: thermodynamique statistique   Same as → statistical mechanics. statistical weight   وزن ِ آماری   vazn-e âmâriFr.: poids statistique   1) Statistics: A number assigned to each value or range of values of a given quantity, giving the number of times this value or range of values is found to be observed. 2) Statistical mechanics: A multiplicative factor in the expression for the probability of finding a system in a given quantum state. Usually the number of degenerate substates contained in the state.→ statistical; → weight. statistics   آمار   âmâr (#)Fr.: statistique   A branch of applied mathematics that deals with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters.From Ger. Statistik "political science," from Mod.L. statisticus (collegium) "state affairs," from It. statista "person skilled in statecraft," from stato "state," ultimately from L. status "position, form of government;" cognate with Pers. ist-, istâdan "to stand" (Mid.Pers. êstâtan; O.Pers./Av. sta- "to stand, stand still; set;" Av. hištaiti; cf. Skt. sthâ- "to stand;" Gk. histemi "put, place, weigh," stasis "a standing still;" L. stare "to stand;" Lith. statau "place;" Goth. standan; PIE base *sta- "to stand").Âmâr "computation, arithmetic; statistics," from âmârdan "to reckon, to calculate," related to ošmârdan, šomârdan, šomordan "to count, to calculate," mar, mâr- "count, reckon, measure," bimar "countless," nahmâr "great, large, big;" Mid.Pers. âmâr "calculating, reckoning;" Av. base mar- "to have in mind, remember, recall," hišmar-; cf. Skt. smr-, smarati "to remember, he remembers," L. memor, memoria, Gk. mermera "care," martyr "witness." stature   بشن، قد   bašn (#), qad (#)Fr.: stature   1) The natural height of a human or animal in an upright position. 2) An achieved level; status (The FreeDictionary.com).M.E., from from O.Fr. stature, estature "build, structure," from L. statura "height, size of body, size," from PIE root *sta- "to stand, make or be firm," cf. Pers. ist-, istâdan "to stand," → opposition.Bašn "stature, height; the body;" Mid.Pers. bašn "the top;" O.Pers. baršan- "height," variant borz "height, magnitude" (it occurs also in the name of the mountain chain Alborz), related to boland "high," bâlâ "up, above, high, elevated, height," berg "mountain, hill;" Mid.Pers. buland "high;" Av. barəz- "high, mount," barezan- "height;" cf. Skt. bhrant- "high;" L. fortis "strong" (Fr. & E. force); O.E. burg, burh "castle, fortified place;" Ger. Burg "castle," Goth. baurgs "city," E. burg, borough, Fr. bourgeois, bourgeoisie, faubourg); PIE base *bhergh- "high." status   استاته   estâtéFr.: status   1) The position of an individual in relation to another or others, especially in regard to social or professional standing. 2) State or condition of affairs (Dictionary.com).From L. status "condition, position, state, attitude" from p.p. stem of stare "to stand," from PIE *ste-tu-, from root *sta- "to stand," → state., + -tus suffix of action.Estâté, from estat, → state, + nuance suffix -é.