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: 13116 Search : far
communication
  همدارگنش   
hamdârganeš

Fr.: communication   

1) The act or process of communicating; fact of being communicated.
2) The imparting or interchange of thoughts, opinions, or information by speech, writing, or signs (Dictionary.com).

Verbal noun of → communicate.

communism
  همدارباوری، همدارگرایی   
hamdârbâvari, hamdâgerâyi

Fr.: communisme   

A theory or system of social organization based on the holding of all property in common, actual ownership being ascribed to the community as a whole or to the state (Dictionary.com).

commune; → -ism.

communitarian
  همدارگان‌گرا، همدارگان‌باور   
hamdârgângerâ, hamdârgânbâvar

Fr.: communautaire-   

A member of a communistic community; an advocate of such a community.

community; → -ary; → -an.

communitarianism
  همدارگان‌گرایی، همدارگان‌باوری   
hamdârgângerâyi, hamdârgânbâvari

Fr.: communautarisme   

A doctrine or system of social organization that upholds the importance of communities. It tends to lessen the focus on individual rights and increase the focus on communal responsibilities.

communitarian; → -ism.

communitary
  همدارگانی   
hamdârgâni

Fr.: communautaire-   

Of or relating to a community; communal.

community; → -ary.

community
  ۱) همدارگان؛ ۲) همداری   
1) hamdârgân; 2) hamdâri

Fr.: communauté   

1a) A social group whose members share common characteristics or interests, such as values, identity, and often a common location (e.g. a village, town, or neighborhood).
1b) Ecology: A group of populations of different species (plants and animals) within a specified location in space and time. 2) Common ownership or participation; joint possession.

Ultimately from L. communitas "partnership, society, fellowship," from communis, → common "common, public, general," + -itas, → -ity

Hamdârgân, from hamdâr, → common, + -gân suffix forming plural entities, from Mid.Pers. -gânag, -gâna, on the model of hamegân, → public.

commutation
  آموتش   
âmuteš

Fr.: commutation   

General: A substitution, exchange, or interchange.
Electronics: The transfer of current from one channel to another in a gas tube.
Electricity: The reversal of direct current into alternating current.
Math: A commutative operation, where a . b = b . a.

Noun from → commute.

commutation rules
  رزن‌های ِ آموتش   
razanhâ-ye âmuteš

Fr.: règles de commutation   

The specification of commutators of operators that in quantum physics correspond to the coordinates and momenta of a system.

commutation; → rule.

commutative
  آموتنده   
âmutandé

Fr.: commutatif   

(adj.) Of or pertaining to → commutation.

Adj. from → commute.

commutative law
  قانون ِ آموتشی   
qânun-e âmuteši

Fr.: loi commutative   

A principle holding for the operations of addition and multiplication (in some number domains) that asserts that the consequence of the given operation is not affected by the order in which the terms are considered. Thus x + y = y + x; x . y = y . x.

commutative; → law. The first use of the word commutative in this sense is ascribed to the French mathematician François Joseph Servois (1768-1847).

commutativity
  آموتندگی   
âmutandegi

Fr.: commutativité   

The state or quality of being commutative.

Noun from → commutative.

commutator
  آموتگر   
âmutgar

Fr.: commutateur   

Math.: The commutator of a and b is the element c of a group such that bac = ab.

Agent noun from → commute.

commute
  آموتیدن   
âmutidan

Fr.: échanger   

To substitute (one thing for another); exchange. → mutation.
Math., logic: To satisfy or engage in a commutative operation.

From L. commutare "to change altogether," from → com- + mutare "to change," from PIE base *mei- "to change, go, move;" cf. Av. miθô "inverted, false," miθaoxta- "wrong spoken;" Skt. methati "changes, alternates, joins, meets," mithah "mutual, reciprocal;" L. meare "to go, pass," mutuus "done in exchange;" Goth. maidjan "to change;" E. prefix mis- (in mistake).

Âmutidan, from intensive prefix â- + mut, from L. mutare cognate with Av. miθô, as above, + -idan infinitive suffix.

comoving
  هم‌جنب، هم‌میاو   
hamjonb, ham-miyâv

Fr.: comobile   

Moving together or in a correlated way.

From → com- "together," + pr.p. of → move.

Hamjonb, ham-miyâv "comoving," from ham- "together," → com-, + jonb or miyav "moving, mover," present stems of jondidan and miyâvidan "→ move."

comoving coordinates
  هماراهای ِ هم‌جنب   
hamârâhâ-ye hamjonb

Fr.: coordonnées comobiles   

A system of coordinates used in cosmology which is fixed with respect to the overall → Hubble flow of the universe. A given galaxy's location in comoving coordinates does not change as the Universe expands.

comoving; → frame.

comoving distance
  اپست ِ هم‌میاو   
apest-e ham-miyâv

Fr.: distance comobile   

1) A distance in → comoving coordinates between two points in space at a given cosmological time. In other words, the distance between two nearby objects in the Universe which remains constant with epoch if the two objects are moving with the → Hubble flow. More specifically, it is the → proper distance divided by the ratio of the → scale factor of the Universe between then, a(t)em, and now, a(t)obs: DC = Dproper . [a(t)obs/a(t)em]. In terms of → redshift (z), it is the proper distance multiplied by (1 + z). At the present epoch, i.e. a = a(tobs) = 1, DC = Dproper. If the objects have no peculiar velocity their comoving distance at any time is the same as their distance today.
The comoving distance of the → cosmic horizon is about 48 × 109light-years.

2) Transverse comoving distance: In a non-flat Universe, the comoving distance between two events at the same → redshift but separated on the sky by some angle. It is expressed by trigonometric functions of → curvature, → comoving distance, and the → Hubble distance accounting for the curvature of space. In a flat universe (Ωk) it is the same as the → comoving distance.

3) Line-of-sight comoving distance: The total line-of-sight comoving distance from us to a distant object computed by integrating the infinitesimal comoving distance contributions between nearby events along the radial ray from the time temit, when the light from the object was emitted, to the time tobs, when the object is observed.

comoving; → distance.

comoving frame
  چارچوب ِ هم‌جنب   
cârcub-e hamjonb

Fr.: rérérentiel comobile   

A → reference frame that is attached to a moving object. The object in this frame is therefore at rest.

comoving; → frame.

comoving volume
  گنج ِ هم‌جنب   
gonj-e hamjonb

Fr.: volume comobile   

The volume that a structure at → redshift  z would have if it was seen at the → current cosmological epoch (defined by z = 0).

comoving; → volume.

compact
  ۱) همپک؛ ۲) همپکیدن، همپک کردن   
1) hampak; 2) hampakidan, hampak kardan

Fr.: 1) compacte; 2) condenser, resserer   

1) Closely and firmly joined or packed together; Occupying little space compared with others of its type.
2) To reduce in size or volume.

M.E., from L. compactus "concentrated," p.p. of compingere "to fasten together," from → com- "with, together" + pangere "to fix, fasten," cf. Gk. pegnunai "to fasten, coagulate;" PIE *pag-/*pak- "to fasten."

1) Hampak, from ham-, → com-, + pak, from pakidé [Mo'in, Dehxodâ] "thick, dense, compact," in Hamadâni pukida "much, full, abundant," Kordi pêk "together, joint," pêk hatin "to be made up of," pêk hênan "to collect, constitute," from PIE *pag-/*pak- as above?
2) Hampakidan, from hampak + -idan infinitive suffix; hampak kardan, from hampak + kardan "to do, make, perform," → -ize.

compact binary star system
  راژمان ِ درین ِ همپک   
râžmân-e dorin-e hampak

Fr.: système binaire compact   

A binary star system which is composed of a collapsed object (→ degenerate dwarf, → neutron star, or → black hole) in orbit with a low-mass (≤ 0.5 Msol) secondary star, wherein the collapsed star → accretes matter from its → companion. These two objects form a binary system of overall dimensions 106 km with an orbital period of only hours or less. See also: → X-ray binary.

compact; → binary; → star; → system.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer aga air Alf Alg alk Alp alt alu amm ana And ang ani ano ant ant Ap apo app app Aqu Arc arg arr asc ass ast ast asy atm ato att aur aut axi B-m bad Bal bar bar Bay Bed ber Bet bif bim bin bio bis bla ble blu Bod Bol bor bou Bra Bre bro bul C-t Cal Cam can car Car Cas cat cav cel cen cer Cha cha Cha che chl Cir cir cir Cla cli clo clu co- coc coh col col col Com com com com com com com com Com con 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 Dan dat Dav de- Deb dec dec dee def deg del Den den der det deu dew dic dif dif dil Dip dir dis dis dis dis dis diu dod Dop dou Dra dua dus dwa dyn DZ Ear ecc eco edi EHB Ein ela ele ele ele ele ell eme emp end Eng ent epi equ equ era ESP eth Eur evi exa exc exe exi exp exp ext ext ext fac fal far fec Fer fer fie fin fir fis fla Flo flu fog for for Fou fra fre fre Fro fun G s Gal gal gal Gar gau geg gen geo geo geo ger gla gly gra gra gra gra gra Gre gro GYR Had Hal hap Har HD hea hel hel Hen Her hex hig Hil hol Hoo hor hou Hub hum hyb hyd hyd hyp hys ide ign ima imp imp in- inc Ind ind ine inf inf inf ini ins ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jor jum K c Kep Ker kin kno lab Lam Lan Lap las lat Le lef len lev lig lig lin lin lin liq Lit loc log lon lou LS lun lun Lym M s Mag mag mag mag mag mag maj man Mar mas mas mat May mea mec mel mer mes met met met mic mid mil Min Mir mix mod mod mol mon mor mov mul mur mys nan nat nav nec Nep neu New New NGC nob nom non non nor nos nuc nuc num nut obj obl obs occ oct off oli oni ope opp opt opt orb ord org orp osc out ove oxi P-w pal par par par par Pas pat pej per per per per per per pha Phe pho pho pho phy pin pla Pla pla pla pla plu poi pol pol Pol pol por pos pot Poy pre pre pre pre pri pri pri pro pro pro pro pro pro Psa pul pum Q i qua qua qua qua R A rad rad rad rad rad rad Ram Ran rat rea rea rec rec red red ref ref reg rei rel rel rem rep res res res ret rev Rho Rie ril riv rog Ros rot rul S A Sag sam sat sca sca Sch Sco Sec sec sec seg sel sem sen set Sha sha shi sho sid sig sim sin Sir ske sli Smo soc sof sol sol sol sol sou sou spa spe spe Spe spe sph spi Spi spr sta sta sta sta sta ste ste ste Sto str str sub sub sub suc sun sup sup sup sup sur swa syn syn tac tas tel tem ter tes the the the the thi thr tid til tip ton tor tou tra tra tra tra Tri tri tru tsu tur two Typ UHE ult unc uni uni uni upg ura uti val var vec Vel ver Ver vie Vir vis vis vol W-R war wav wav wea Wei wha wid win WN3 Wol wri xen yok zen zij > >>