Cosmology: In the early history of the Universe, separation of matter and radiation due to their non-interaction. At a redshift of 1000, that is about 400,000 years after the Big Bang, the temperature would have cooled to the point (4000 degrees Kelvin) where electrons and nuclei can recombine and form neutral hydrogen atoms. Since atoms do not scatter the radiation appreciably, free electrons were lacking, and the Universe became transparent to radiation. Same as → recombination. See also → decoupling era.
dowrân-e vâjafsari, ~ vâjofteš
Fr.: époque du découplage
1) kâstan (#), kâhidan (#); 2) kâheš (#)
Fr.: 1) décroitre; 2) décroissance
1) (v.tr.) To cause to diminish, to make less. (v.intr.) To diminish or
lessen in extent, quantity, power, etc.
Kâstan, kâh-, from Mid.Pers. kâhitan, kâstan, kâhênitan "to decrease, diminish, lessen," Av. kasu- "small, little" (Mod.Pers. keh), Proto-Iranian *kas- "to be small, diminish, lessen;" kâheš verbal noun from kâhidan.
1) The amount lost in the process of decreasing.
L decrementum, from decre(tus), → decrease + -mentum noun suffix -ment.
Kâheh, from kâh- present stem of kâhidan, → decrease + noun suffix -é.
To derive as a conclusion from facts or premises.
L. deducere "to lead down, derive," from → de- "down" + ducere "to lead."
Foruhâxtan, foruhâzidan, from foru- "down," → de- + Mid.Pers. hâxtan, hâzidan "to lead, guide, persuade," Av. hak-, hacaiti "to attach oneself to, to join," cf. Skt. sacate "accompanies, follows," Gk. hepesthai "to follow," L. sequi "to follow;" PIE *sekw- "to follow."
1) The act or process of deducting; something that is or may be deduced.
Verbal noun from → deduce.
Of or relating to → deduction.
Fr.: raisonnement déductif
1) žarf (#), gowd (#); 2) žarfnâ (#)
Fr.: 1) profond; 2) profondeur
1a) General: Extending well inward from an outer surface or back from an edge.
O.E. deop, from P.Gmc. *deupaz, from PIE *d(e)u- "deep, hollow."
Žarf "deep;" variants Gilaki jalf, julf, jal; Tabari
jol, jal, jul; Baluci jahl, johl; Kermâni jarr "deep;"
Mid.Pers. zufr; Av. jafra- "deep."
Fr.: pose profonde
An exposure in which the detector shutter remains open for a relatively long time in order to bring out the weaker features of the observed object. In practice a deep exposure with a CCD detector is usually obtained from co-addition of shorter exposures.
Fr.: champ profond
An area on the sky whose image is obtained with a deep exposure, such as → Hubble Deep Field.
Fr.: image profonde
An image obtained using a deep exposure to reveal the weak features of the object.
Fr.: temps profond
The time-scale of geologic processes which is millions or billions of years in contrast to the few thousand years claimed by supporters of the → creationism. The concept of "deep time" was first described in 1788 by the Scottish geologist James Hutton (1726-1797) in the Transactions of the Royal Society of Edinburgh. The term was coined by the American author John McPhee (1931-).
1) Failure to act; inaction or neglect; failure to meet financial obligations.
M.E. defau(l)te, O.Fr. defaute "fault, defect, failure," from V.L. *defallita "a deficiency or failure," p.p. of *defallere, from L. → de- "away" + fallere "to deceive, to cheat; to put wrong, to lead astray."
âk; kâst (#)
General: Something or a lack of something that results in incompleteness,
inadequacy, or imperfection.
From L. defectus "failure," from p.p. of deficere "to fail, desert," from → de- "down, away" + facere "to do," (cf. Fr. faire, Sp. hacer), from PIE base *dhe- "to put, to do" (cf. Av. dadaiti "he puts," Skt. dadhati "puts, places," Hitt. dai- "to place," Gk. tithenai "to put."
Âk "defect, blemish;" Mid.Pers. ak, âk "evil, harm;"
Av. aka- "bad, wicked;" cf. Skt. aka- "pain , trouble."
1) To ward off attack from; guard against assault or injury.
A person who defends someone or something.
1) Resistance against attack; protection.
Noun from → defend.