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

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

Homepage

Number of Results: 3105 Search : on
 relaxation   واهلش   vâheleš (#)Fr.: relaxation   1) The evolution of the properties of a physical system which has been disturbed and which regains its equilibrium condition once the disturbing action has ceased. Relaxation is the response of the system to the perturbation. The time required by the system to regain its condition of minimum energy is called the → relaxation time. 2) Math.: In numerical analysis, a method of solving equations in which the errors, or residuals, resulting from an initial approximation are reduced by succeeding approximations until finally all are within the toleration limit.Verbal noun of → relax. relaxation time   زمان ِ واهلش   zamân-e vâhalešFr.: temps de relaxation   The characteristic length of time that is required for a system undergoing → relaxation to move to its equilibrium state. If the system follows an exponential law G = G0 exp(-t / τ), the relaxation time is the time required for G to obtain the fraction 1/e of its initial value G0.→ relaxation; → time. remote control   دور-کنترول، کنترول از دور   dur kontrol (#), kontrol az dur (#)Fr.: commande à distance   1) Control of the operation or performance of an apparatus from a distance, as the control of a guided missile by radio signals. 2) A device used to control the operation of an apparatus or machine, as a television set, from a distance.→ remote; → control. renormalization   باز‌هنجارورش   bâzhanjârvarešFr.: renormalisation   A mathematical process used in quantum physics that avoids infinite terms by carefully defining fundamental quantities such as mass and charge.→ re-; → normalization. repetition   بازگرش   bâzgaršFr.: répétition   The act of repeating; repeated action, performance, production, or presentation.From L. repetitionem (nominative repetitio), from repetitus, p.p. of repetere "to do or say again."Bâzgarš from bâz-, → re-, + garš "turn, time (indicating multiplication, as in three times, four times, etc.," aquivalent to Fr. fois), related to gez in hargez "ever, always; never," garz in hagarz "never." Garš has numerous variants in Pers. dialects, all denoting "turn, times" (بار، دفعه), e.g. [Mo'in]: gazak; Qâyeni: gaš; Hamadâni, Qomi: kaš; Lori: gey, gel; Semnâni, Sorxeyi, Lâsgardi, Sangesari: gazak; Gilaki: garaš; Tâleši: gara, vera, verxa; Tabari: gal, gel; Tâti Karingâni: kat; Kermâni: karet; related to Av. hakərət "once," from *ha(m)-kar-, the second element meaning "to do;" Pers; kardan; cf. Skt. sakrt "once, repeated; ever; never." representation   نمایش، نمایندگی   nemâyeš (#), nemâyandegi (#)Fr.: représentation   1) The act or the action of representing; the state of being represented. 2) The expression by some term, character, symbol, or the like.M.E. representacion, from L. repraesentation, from repraesentatus p.p. of repraesentare, from → re- + praesentare "to show, give, present for approval," from praesens, from praeesse "to be before others, to be present," from prae- "before," → pre- + esse "to be," cognate with Pers. ast "is," astan, hastan "to be."Nemâyeš, nemâyandegi, from nemudan "to show, demonstrate, exhibit," → display reproduction   بازفر‌آورش   bâzfarâvarešFr.: reproduction   1) The act of reproducing or the condition or process of being reproduced. 2) Something reproduced, especially in the faithfulness of its resemblance to the form and elements of the original. 3) Biology: Any of various processes, either sexual or asexual, by which an animal or plant produces one or more individuals similar to itself (TheFreeDictionary.com).→ reproduce; → -tion. repulsion   وازنش   vâzaneš (#)Fr.: répulsion   Physics: The force that acts between bodies of like electric charge or magnetic polarity, tending to separate them.Verbal noun of → repulse. resignation   واگامش   vâgâmešFr.: démision   The act of resigning.Verbal noun from → resign. resolution   واگشود   vâgošudFr.: résolution   1) The degree to which an → optical system renders visible separate parts of an object. Also known as → angular resolution and → spatial resolution. See also → spectral resolution. 2) The time interval between successive discernible signals. → temporal resolution.Verbal noun of → resolve. resolution of a force   واگشود ِ نیرو   vâgošud-e niruFr.: résolution de force   Finding the → components of a → force which act in specified → directions.→ resolution; → force. resonance   باز‌آوایی   bâzâvâyi (#)Fr.: résonance   1) The state of a → mechanical system in which the → amplitude of → oscillation is increased when it is subjected to stimulus from another source at or near its own natural → frequency. 2) The condition of an electrical circuit with respect to a given frequency in which the net reactance is zero and the current flow a maximum. 3) A relationship in which the → orbital period of one body is related to that of another by a simple integer fraction, such as 1/2, 2/3, 3/5. → Laplace resonance, → Lindblad resonance, → resonance orbit . 4) → resonance particle.Resonance, from M.Fr. resonance, from L. resonantia "echo," from resonare "to resound," from re- "again, back" + sonare "to sound."Bâzâvâyi, from bâz- "again, back," → re-, + âvâ "voice, sound" (related to âvâz "voice, sound, song," bâng "voice, sound, clamour" (Mid.Pers. vâng), vâžé "word;" Av. vacah- "word," vaocanghê "to decalre" (by means of speech), from vac- "to speak, say;" cf. Skt. vakti "speaks, says," vacas- "word;" Gk. epos "word;" L. vox "voice;" PIE base *wek- "to speak") + -yi noun suffix. resonance capture   گیر-اُفت ِ باز‌آوایی   gir-oft-e bâzâvâyiFr.: capture résonante   Capture by an atomic nucleus of a particle whose energy is equal to one of the energy levels of the nucleus.→ resonance; → capture. resonance frequency   بسامد ِ باز‌آوایی   basâmad-e bâzâvâyiFr.: fréquence de résonance   The frequency at which a system is in → resonance.→ resonance; → frequency. resonance line   خط ِ باز‌آوایی   xatt-e bâzâvâyiFr.: raie de résonance   For a particular atom, the spectral line corresponding to the longest wavelength arising from a transition between the ground state and an excited state.→ resonance; → line. resonance orbit   مدار ِ باز‌آوایی   madâr-e bâzâvâyiFr.: orbite de résonance   An orbit which is in → orbital resonance with another orbit.→ resonance; → orbit. resonance particle   ذرّه‌ی ِ باز‌آوایی   zarre-e bâzâvâyiFr.: particule de résonance   A hadronic particle which exists for only a very brief time (10-23 seconds) before decaying into hadrons; also called resonance. The existence of a resonance cannot be observed directly; it can only be inferred from studying the longer-lived products of its decay.→ resonance; → particle. resonance region neutron   نوترون ِ ناحیه‌ی ِ باز‌آوایی   notron-e nâhiye-ye bâzâvâyiFr.: neutron dans la région de résonance   A neutron with an energy between 1 eV and 0.01 MeV.→ resonance; → region; → neutron. resonant   باز‌آوا   bâzâvâFr.: résonnant   Pertaining to a system in a state of → resonance; producing resonance; resounding.Verbal adj. from → resonate. resonant circuit   برقراه ِ باز‌آوا   barqrâh-e bâzâvâFr.: circuit résonnant   An electrical circuit containing both capacitance and inductance in such a way that a certain periodic electric oscillation will reach maximum amplitude.→ resonant; → circuit.