# 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: 1965 Search : ion
 proportional   برپارشی   barpârešiFr.: proportionnel   Being in or characterized by proportion. Math.: Of two quantities, having the same or a constant ratio or relation.→ proportion + → -al. proportional counter   شمارگر ِ برپارشی   šomârgar-e barpârešiFr.: compteur proportionnel   A device in which an electronic detection system receives pulses that are proportional to the number of ions formed in a gas-filled tube by ionizing radiation.→ proportional; → counter. proportionality   برپارشیگی   barpârešigiFr.: proportionalité   Math.: A relationship bewteen two quantities such that if one quantity changes the other changes in the same proportion; denoted as y ∝ x.→ proportional + → -ity. proportionality constant   پایای ِ برپارشیگی   pâyâ-ye barpârešigiFr.: constante de proportionalité   Math.: A → constant that converts a proportionality into an → equation. Thus the proportionality constant k converts the proportionality y ∝ x into the equation y = kx. proposition   فراهل، گزاره   farâhel, gozâré (#)Fr.: proposition   1) The act of offering or suggesting something to be considered, accepted, adopted, or done. 2) A plan or scheme proposed. 3) Logic: A statement in which something is affirmed or denied, so that it can therefore be significantly characterized as either true or false. 4) Math.: A formal statement of either a truth to be demonstrated or an operation to be performed; a theorem or a problem (Dictionary.com).Verbal noun of → propose. propositional   گزاره‌ای   gozaare#ay (#)Fr.: propositionnel   Logic: Of, relating to, or in the form of a → proposition.→ proposition; → -al. propositional constant   پایای ِ گزاره‌ای   pâyâ-ye gozaare#ayFr.: constante propositionnelle   Logic: A → propositional symbol that represents a → specific → proposition. propositional logic   گوییک ِ گزاره‌ای، ~ گزاره‌ها   guyik-e gozâre-yi, ~ gozaarehâFr.: logique propositionnelle   A branch of logic that deals with the → truth values of logical statements (→ sentences, → propositions) and uses → logical connectives to build more complex → expressions. The distinctive feature of propositional logic is that it does not deal with logical relationships and properties that involve the parts of a statement smaller than the simple statements making it up. The propositions are evaluated as → true or → false. A more expressive system is provided by the → first-order logic.→ proposition; → -al; → logic. propositional symbol   نماد ِ گزاره‌ای   nemâd-e gozâreyiFr.: symbole propositionnel   An upper case letter, e.g. "A," "B," "C," etc. representing a → proposition. Propositional symbols are divisible into two sorts: → propositional constants and → propositional variables.→ propositional; → symbol. propositional variable   ورتنده‌ی ِ گزاره‌ای   vartande-ye gozâre-yiFr.: variable propositionnel   Logic: A → propositional symbol that represents any → proposition whatsoever. propulsion   پیشرانش   pišrâneš (#)Fr.: propulsion   The act or process of propelling. The state of being propelled.Verbal noun from → propel. protestation   پاخوسش   pâxosešFr.: protestation   1) The act of protesting. 2) Formal expression or declaration of objection, dissent, or disapproval (Dictionary.com).→ protest; → -tion. proton-proton reaction   واژیرش ِ پروتون-پروتون   vâžireš-e-e proton-protonFr.: réaction proton-proton   A → thermonuclear reaction in which two protons collide at very high velocities and combine to form a → deuterium. See also → proton-proton chain.→ proton; → reaction. provocation   فراوچ   farâvacFr.: provocation   1) The act of provoking. 2) Something that → incites, → instigates, angers, or irritates (Dictionary.com).Verbal noun of → provoke. public opinion   پژان ِ همگانی   pažân-e hamegâniFr.: opinion publique   The collective opinion of many people on some issue, problem, etc., especially as a guide to action, decision, or the like (Dictionary.com).→ public; → opinion. publication   واگانش   vâgânešFr.: publication   1) The act of publishing a book, periodical, map, piece of music, engraving, or the like. 2) The act of bringing before the public; announcement. 3) The state or fact of being published (Dictionary.com).Verbal noun of → publish. pulsation   تپش   tapeš (#)Fr.: pulsation   The act of pulsating; beating or throbbing; vibration or undulation. → stellar pulsation.Verbal noun of → pulse. pulsation mode   ترز ِ تپش، مُد ِ ~   tarz-e tapeš, mod-e ~Fr.: mode de pulsation   The way in which pulsations occur in a star due to the fact that stars act as resonant cavities, as studied in → asteroseismology. A star may pulsate either with approximately spherical symmetry (radial pulsation), or as a series of waves running across the surface (non-radial pulsation). Pulsation may occur in a single mode or in multiple modes, depending on the type of star. Three different modes of pulsations have been detected through the → helioseismology of the → Sun: → p mode, → g mode, and → f mode, generated by acoustic, gravity, and surface gravity waves respectively. Also called → oscillation mode.→ pulsation; → mode. pulsational   تپشی   tapešiFr.: pulsationnel   Of or pertaining to → pulsation. → pulsational instability; → pulsational pair-instability supernova.→ pulsation; → -al pulsational instability   ناپایداری ِ تپشی   nÃ¢pÃ¢ydÃ¢ri-ye tapešiFr.: instabilitÃ© pulsationnelle   A term used to describe irregularly spaced, fine-scale structure in optically thick rings. The process relies on a combination of viscosity and self-gravity of ring material to produce this fine structure. Also known as overstability (Ellis et al., 2007, Planetary Ring Systems, Springer).