An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12955 Search : far
ideal gas law
  قانون ِ گاز ِ آرمانی، ~ ~ مینه‌وار   
qânun-e gâz-e ârmâni, ~ ~ minevâr

Fr.: loi des gaz parfaits   

An → equation of state that relates pressure (P), temperature (T), and volume (V) of an ideal or → perfect gas: PV = nRT, where n is the number of → moles of gas present and R is the → universal gas constant. Equivalently: PV = NkT, where N is the number of atoms of gas present and k is → Boltzmann's constant.

ideal; → gas; → law.

ideal magnetohydrodynamics (MHD)
  مغنات-و-هیدروتوانیک ِ آرمانی، ~ مینه‌وار   
meqnâtohidrotavânik-e ârmâni, ~ minevâr

Fr.: magnétohydrodynamique idéale   

Magnetohydrodynamics of a → plasma with very large (infinite) → conductivity. In this condition, → Ohm's law reduces to E = -v × B, where E represents → electric field, B → magnetic field, and v the → fluid velocity. Ideal MHD is the simplest model to describe the dynamics of plasmas immersed in a magnetic field. It is concerned with → one-fluid magnetohydrodynamics and neglects → resistivity. This theory treats the plasma composed of many charged particles with locally neutral charge as a continuous single → fluid. Ideal MHD does not provide information on the velocity distribution and neglects the physics relating to wave-particle interactions, as does the two-fluid theory as well. It does have the advantage that the macroscopic dynamics of the → magnetized plasma can be analyzed in realistic three-dimensional geometries (K. Nishikawa & M. Wakatani, 2000, Plasma Physics, Springer). See also → non-ideal magnetohydrodynamics.

ideal; → magnetohydrodynamics.

idealism
  مینه‌باوری   
minebâvari

Fr.: idéalisme   

Any one of a variety of systems of philosophical thought, which would make the ultimate reality of the Universe expressible or intangible only in terms of idea in mind, rather than in terms of matter in space.

From → ideal, see also → idea, + → -ism.

identical
  یکسان، همیدان   
yeksân (#), hamidân

Fr.: identique   

Similar or alike in every way; being the very same; agreeing exactly.

From M.L. identicus "the same," from L.L. identitas "identity," from idem "the same," from id "it, that one" + demonstrative suffix -dem.

Yeksân "the same, similar," from yek, → one, + -sân "manner, semblance" (variant sun, Mid.Pers. sân "manner, kind," Sogdian šôné "career").
Hamidân, from Mid.Pers. hamêtôn "identical."

identification
  ایدانش   
idâneš

Fr.: identification   

1) An act or instance of identifying; the state of being identified.
2) Psychology: The process of associating the self closely with other persons and assuming their characteristics or views unconsciously or partially so.
3) In psychological theories, a phase of recognition, the way in which the child's personality is formed by modeling it on a chosen parent.

Verbal noun of → identify.

Idâneš, verbal noun of idânidanidentify.

identification of lines
  ایدانش ِ خطها   
idâneš-e xatthâ

Fr.: identification de raies   

Recognizing the lines in the spectrum of a star, nebula, galaxy, etc. using a calibration template.

identification; → line.

identifier
  ایدانگر   
idângar

Fr.: identifiant   

Computers: 1) One or more characters used to identify, name, or characterize the nature, properties, or contents of a set of data elements.
2) A string of bits or characters that names an entity, such as a program, device, or system, in order that other entities can call that entity.
3) In programming languages, a lexical unit that names a language object, such as a variable, array, record, label, or procedure.

Agent noun of → identify.

identify
  ایدانیدن   
idânidan

Fr.: identifier   

To recognize or establish as being a particular person or thing; e.g. → identification of lines.

Identify, from Fr. identifier, from identité, → identity.

Idânidan, infinitive from idâni, → identity.

identity
  ایدانی، این‌همانی، کیستی، چیستی   
idâni, inhamâni (#), kisti (#), cisti (#)

Fr.: identité   

1) Math.: An equation that is valid for all values of its variables. A mathematical relationship equating one quantity to another.
2) Logic: An assertion that two terms refer to the same thing.
3) Psychology: The character of persisting unchanged. The feeling that one knows who one really is.

From M.Fr. identité, from L.L. identitas "sameness," from ident-, combining form of L. idem "the same; at the same time; also; moreover," from id "it, that one" + demonstrative suffix -dem + -itas a suffix used to form abstract nouns expressing state or condition.

Idâni, from iduni, from Mid.Pers. êdônih "being this, being that, being so, the manner of being," from êdôn "thus, so," Mod.Pers. idun "this, in this manner, now;" O.Pers. aita- demonstrative pronoun "this;" Av. aēta- "this; this here; this now," aētaδ- (adv.) "here, there; then, thus; thereupon;" cf. Skt. etad "this," iti "thus, in this manner;" akin to L. idem, as above.

identity axiom
  بنداشت ِ ایدانی   
bondâšt-e idâni

Fr.: axiome d'identité   

A basic rule in → group theory stating that there exists a unit group element e, called the identity, such that for any element a of the group a * e = e * a = a.

identity; → axiom.

identity element
  بن‌پار ِ ایدانی   
bonpâr-e idâni

Fr.: élément neutre   

In a mathematical system, an element which leaves unchanged any other element on which it operates. Thus 0 is the identity element for addition: a + 0 = a. And 1 is the identity element for multiplication: a . 1 = a.

identity; → element.

identity function
  کریای ِ ایدانی   
karyâ-ye idâni

Fr.: fonction d'identité   

Math.: Any function f for which f(x) = x for all x in the domain of definition.

identity; → function.

identity matrix
  ماتریس ِ ایدانی   
mâtris-e idâni

Fr.: matrice identité   

In linear algebra, the simplest nontrivial diagonal matrix, an n-by-n square matrix with ones on the main diagonal and zeros elsewhere.

identity; → matrix.

identity operator
  آپارگر ِ ایدانی   
âpârgar-e idâni

Fr.: opérateur d'identité   

An operator which takes a real number to the same real number.

identity; → operator.

if
  اگر   
agar (#)

Fr.: si   

(Conjunction) in case that; granting or supposing that; on condition that. → if and only if.

M.E., from O.E. gif; akin to O.H.G. ibu "if."

Agar "if," from Mid.Pers. agar, hakar "if;" O.Pers. ha-karam "once;" from ha- "one," variant ham-, → com- (cf. Av. ha-; Skt. sa-; Gk. ha-; L. sem-; PIE *sem- "one"), + karam- "a time," maybe from kar- "to do; doing," → work; cf. Av. hakərət "once;" Skt. sakrt "once;" Gk. hapaks "once;" L. semel "once."

if and only if (iff)
  اگر و ایواز اگر، ~ ~ تنها ~   
agar va ivâz agar, ~ ~ tanhâ ~

Fr.: si et seulement si   

Logic, Math.: An → expression indicating that two → statements so connected are → necessary and sufficient conditions for one another. The corresponding logical symbols usually used are: ↔, ⇔, ≡, and iff.

if; → and; → only.

igneous rock
  سنگ ِ آذرین   
sang-e âzarin (#)

Fr.: roche ignée   

A → rock formed by the solidification of molten material that originated within the Earth (as → magma or → lava).

Igneous, from L. igneus "of fire, fiery," from ignis "fire," from PIE *egni- (cf. Skt. agni- "fire, sacrificial fire," O.C.S. ogni, Lith. ugnis "fire"); → rock.

Sang "stone, rock," → stone; âzarin "fiery," from âzar, variants âtaš, taš, from Mid.Pers. âtaxš, âtur "fire;" Av. ātar-, āθr- "fire," singular nominative ātarš-; O.Pers. ātar- "fire;" Av. āθaurvan- "fire priest;" Skt. átharvan- "fire priest;" cf. L. ater "black" ("blackened by fire"); Arm. airem "burns;" Serb. vatra "fire;" PIE base *āter- "fire" + -in adj. suffix.

ignite
  ۱) گیراندن؛ ۲) گرفتن   
1) girândan; 2) gereftan (#)

Fr.: 1) enflammer, allumer; 2) s'enflammer, s'allumer   

1) To set on fire.
2) To take fire, to begin to burn.

From L. ignitus, p.p. of ignire "to set fire," from ignis "fire, flame, light."

Girândan transitive form of gereftan "to take, catch" (Mid.Pers. griftan, Av./O.Pers. grab- "to take, seize," cf. Skt. grah-, grabh- "to seize, take," graha "seizing, holding, perceiving," M.L.G. grabben "to grab," from P.Gmc. *grab, E. grab "to take or grasp suddenly;" PIE base *ghrebh- "to seize").

ignition
  گیرانش؛ گیرش   
girâneš; gireš (#)

Fr.: inflammation, allumage   

1) The act or fact of igniting; state of being ignited.
2) The process of setting something on fire.

Verbal noun of → ignite.

ignition temperature
  دمای ِ گیرانش   
damâ-ye girâneš

Fr.: température d'inflammation   

The minimum temperature to which a fuel must be heated in order to initiate self sustained combustion independent of another heat source.

ignition; → temperature.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu coa coe coh col col col com com com com com com com com com con con con con con con con con con con con coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis diu dog Dop dou Dra dua dus dwa dyn e-f Ear ecl eco edu eig Ein ela ele ele ele Ele elo emi emp ene Enl env epi equ equ Eri est Euc eva evo exc exc exh Exo exp exp ext ext f(R fac fam fat fee Fer Fib fig fin fir fix fle flu foc for for for fra fre Fre fri fun fuz Gal gal gal Gam gau Gay gen Geo geo geo geo gim glo gov gra gra gra gra gre gro Gun hab hal han Har haz hea hel hel Hen Her het Hig hil hol Hoo hor hou Hub hum hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind Ind inf inf inf inf inn ins ins int int int int int int int int inv ion ion Irr iso iso iso jan jit Jul jus Kel ker kin kni La lam lan Lap las lat Lay Led Len let lif lig lin lin lin liq Lit loc log lon lou low lum lun Lym M d Mag mag mag mag mag mag maj man mar mas mas mat mea mea mec mem mer Mes met met mho mic Mie Mil min mis MKS MOd mol Mon moo mot mul mul myo nak Nas nat neb neg neu neu New New nit noi non non nor nor nuc nuc nul nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi pai Pan par par Par par pas Pav Pel per per per per Per per pha phi pho pho pho phy Pip Pla pla PLA pla ple plu pol pol pol pol pop pos pos pot Pra pre pre pre Pri pri pri pro pro pro pro pro pro pro Pto pul pur qua qua qua qua qui rad rad rad rad rad rad rai ran rar Ray rea rea rec rec red red ref ref reg rel rel rel rep res res res res ret RHB rid rig ris roc Ros rot rub Rut Sag sam sat sca sca Sch sci Sea sec sec see sel sem sen set Sha sha shi shu sid sil sim sin SIS ski Slo smo Soc sol sol sol sol son sou spa spa spe spe spe sph spi spi Spo squ sta sta sta sta Ste ste ste sto str str str sub sub suc sun sup sup sup sup sur Swa syn syn tab tar tel tem ter tes the the the the Tho thr tid tim Tit top tot tra tra TRA tra tre tri tri tru Tun Tus tym Typ ult unb und uni uni uns upp Urs vac van var Vei Ven ver vic Vir vir vis vol W 4 war wat wav wea wed wet wid win WN2 Wol wri xen yok zen zin > >>