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Fr.: erreur observationnelle
The difference between a measured value of quantity and its true value.
1) A particular time, especially as marked by certain circumstances or occurrences.
M.E. occasioun from O.Fr. ochaison, ocasion "cause, reason, pretext; opportunity," from L. occasionem (nominative occasio) "appropriate time," from occasum, occasus "fall; sunset," p.p. of occidere "fall down, go down," from ob "down, away" + cadere "to fall," → case.
Âkatan, from prefix â- + katan "to fall," cf. Laki: katen "to fall," kat "he/she fell," beko! "fall!" (an insult); katyâ "fallen;" Lori: kat "event, error;" Kurd. (Soriani): kawtin "to fall, befall," kett "fallen;" Kurd. (Kurmanji): da.ketin "to fall down;" Lârestâni: kata "to fall;" Garkuyeyi: darkat, varkat "he/she fell (sudden death);" Gilaki (Langarud, Tâleš): katan "to fall," bakatam "I fell," dakatan "to fall (in a marsh, in a pit)," vakatan "to fall from tiredness, be exhausted," fakatan "to fall from (i.e., lose) reputation;" Tabari: dakətə "fallen," dakətən "to crash down," dakət.gu "stray cow;" Proto-Iranian *kat- "to fall;" cf. L. cadere "to fall," → case, Pers. kâté.
1) Occurring or appearing at irregular or infrequent intervals; occurring now and then.
1) The process of occluding. Something that occludes.
The blocking of light from an astronomical object, such as a star, by another object, such as the Moon or an asteroid, that passes in front of it. Also, the period of time for which this blocking takes place. A → solar eclipse is a particular case of occultation. Determining the moment of stellar occultation by the Moon is used to improve our knowledge of the lunar orbit. Moreover, the occultation of stars by asteroids or planetary satellites provide important data for better measuring the sizes of the occulting bodies. See also → grazing occultation.
M.E. from L. occultation- "a hiding," from occultat(us), p.p. of occultare "to conceal, keep something hidden," frequentative of occulere "to cover over, conceal," from ob "over" + a verb related to celare "to hide," from PIE base *kel- "to conceal."
Forupušân, from foru- "down, downward; below; beneath" (Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain") + pušân p.pr. of pušândan, accusative of pôšidan, pôš- "to cover; to wear" (related to pust "skin, hide;" Mid.Pers. pôst; O.Pers. pavastā- "thin clay envelope used to protect unbaked clay tablets;" Skt. pavásta- "cover," Proto-Indo-Iranian *pauastā- "cloth").
The act of occupying; the state of being occupied.
Verbal noun of → occupy.
Fr.: observation hors source
An observation when the telescope is pointed away from the source in order to measure the sky background contribution.
Fr.: dissipation ohmique
1) A loss of electric energy due to conversion into heat when a current
flows through a resistance. Same as Ohmic loss.
old stellar population
porineš-e setâre-yi-ye kohan
Fr.: population stellaire vielle
A population of stars in a stellar system that have definitely left the → main sequence.
Fr.: réduction enligne
Preliminary reduction of observational data at a telescope simultaneously with their acquisition.
Fr.: observation sur la source
In comparison with → off-source observation, an observation which is concerned with the source itself.
on-the-spot (OTS) approximation
An approximation in the treatment of photoionized → H II regions, whereby secondary ionizing photons are absorbed immediately very close to their site of emission. The secondary photons, produced by → radiative recombinations directly to the → ground states, are thus ignored with respect to the ionizing photons emitted by the → exciting star. The OTS approximation requires that the ionized gas be sufficiently dense so that secondary ionizing photons are very likely absorbed within the H II region.
Fr.: écoulement uni-dimensionnel
A hypothetical flow in which all the flow parameters may be expressed as functions of time and one space coordinate only. This single space coordinate is usually the distance measured along the center-line of some conduit in which the fluid is flowing (B. Massey, Mechanics of Fluids, Taylor & Francis, 2006).
A plant, Allium cepa, of the amaryllis family, having an edible, succulent, pungent bulb (Dictionary.com).
M.E., from Anglo-French union, O.Fr. oignon "onion," from L. unio-, also "pearl," literally "one, unity;" sense connection is the successive layers of an onion.
Mid.Pers. payâz, payâc; cf. Sogd. piyâk "onion," Yidgha piq, Vakhi piûk, Yazghulami piyeq, Kurd. pivaz; maybe related to PIE *peuk- "to prick, to sting, to stab," because of its pungent taste; cf. Gk. peukos "sting, prick, cusp, peak."
1) General: An act or instance, process, or manner of functioning or operating.
Verbal noun of → operate
Pertaining to a process or series of actions for achieving a result.
Adj. of → operation.
Fr.: calcul opérationnel
A method of mathematical analysis which in many cases makes it possible to reduce the study of differential operators, pseudo-differential operators and certain types of integral operators, and the solution of equations containing them, to an examination of simpler algebraic problems. It is also known as operational analysis.
In the philosophy of science, the view that → concepts are defined in terms of measuring operations which determine their applicability. Same as operationism.
1) A belief or judgment that rests on grounds insufficient to produce complete
M.E., from O.Fr., from L. opinion- "opinion, conjecture; appreciation," from opinari "to think, judge, suppose," from PIE *op- "to choose."
Pažân, from Pashto pažân / pêžân, from prefix- pa-, originally *pati-, + žân variant of Pers. dân-, dânestan "to know," zân as in farzâne "intelligent, wise;" Balochi zân, Kurd. zân "to know;" cf. Sogd. patzân, Khotanese paysân- "to know;" Yidgha and Munji vəzân "to know;" Yizghulami vəzan, Yaghnobi bīzon, Sarigholi pajan, Ormuri pazán "to know;" Av. paiti-zan- "to recognize, acknowledge, appreciate;" from prefix paiti- + zan- "to know, have knowledge;" Mod.Pers. dân-, dânestan "to know," variant šenâxtan "to know, recognize," → science.
1, 2) pâdist; 3, 4) pâdistân
1) The action of opposing, resisting, or combating.
Verbal noun of → oppose.
Pâdist "standing against," from pâd-
"agaist, contrary to," → anti-,
+ ist present stem of istâdan "to stand"
O.Pers./Av. sta- "to stand; to 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 set, stand").