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unidentified flying object (UFO)
barâxt-e parande-ye nâ-idânidé, padide-ye havâ-fazâyi-ye nâ-idânidé
Fr.: Objet Volant Non Identifié (OVNI)
Any flying object or phenomenon that cannot be identified by the observer.
Unidentified Infrared Band (UIB)
bând-e forusorx-e nâ-idânidé
Fr.: bande infrarouge non identifiée
A no longer in general use name for → Aromatic Infrared Band.
Fr.: raie non identifiée
A spectral line whose origin is not clearly established. → line identification.
1) The process of unifying or uniting; union.
Verbal noun of → unify.
Without variations; identical, always the same in quality, degree, character, or manner.
Yekdis, from yek, → uni-, + dis, → form; yeknavâxt, literally "with one rhythm," from yek, → one, + navâxt "rhythm," from navâxtan, navâzidan "to play an instrument; to gratify," navâ "music, song, melody" (Mid.Pers. nw'c "to treat kindly, honour," niwag "music, melody;" Proto-Iranian *ni-uac-, from ni- "down; into," → ni- (PIE), + *uac- "to speak, treat kindly").
uniform circular motion
jonbeš-e dâyereyi-ye yekdis, ~ ~ yeknavâxt
Fr.: mouvement circulaire uniforme
The motion of an object around a fixed point at a constant angular speed, and at constant radius.
meydân-e yekdis, ~ yeknavâxt
Fr.: champ uniforme
A field that at a given instant has the same value at all points within a specified region of interest.
→ uniform; field.
uniform magnetic field
meydân-e meqnâtisi-ye yekdis
Fr.: champ magnétique uniforme
A → magnetic field whose direction does not change and whose strength is constant at every point.
jonbeš-e yekdis, ~ yeknavâxt
Fr.: mouvement uniforme
→ uniform; motion.
→ uniformity + -arian.
The doctrine whereby geologic processes (→ erosion, → deposition, → compaction, and → uplift) observed at Earth's surface now are the same that have shaped Earth's landscape over long periods of time in the past. The term uniformitarianism was first used in 1832 by William Whewell, to present an alternative explanation for the origin of the Earth. The prevailing view at that time was that the Earth was created through supernatural means and had been affected by a series of catastrophic events such as the biblical Flood. This theory is called → catastrophism. The ideas behind uniformitarianism originated with the work of Scottish geologist James Hutton. In 1785, Hutton presented at the meetings of the Royal Society of Edinburgh that the Earth had a long history and that this history could be interpreted in terms of processes currently observed. For example, he suggested that deep soil profiles were formed by the weathering of bedrock over thousands of years. He also suggested that supernatural theories were not needed to explain the geologic history of the Earth (PhysicalGeography.net).
The state or quality of being uniform.
yegânestan (#), yegânidan (#)
To make or become a single unit or entity. → grand unified theory
M.Fr. unifier, from L.L. unificare "to make one," from L. uni-, → one, + facere "to make" (cf. Fr. faire, Sp. hacer), from PIE base *dhe- "to put, to do" (cognate with Mod.Pers. dâdan "to give;" O.Pers./Av. dā- "to give, grant, yield," dadāiti "he gives; puts;" Skt. dadáti "puts, places;" Hitt. dai- "to place;" Gk. tithenai "to put, set, place;" Lith. deti "to put;" Czech diti, Pol. dziac', Rus. det' "to hide," delat' "to do;" O.H.G. tuon, Ger. tun, O.E. don "to do").
Yegânestan, yegânidan "to make one," infinitive from yek, → one.
Difficult or impossible to believe.
General: The act of uniting two or more things.
M.E. from O.Fr. union from L.L. unionem (nominative unio) "oneness, unity," from unus, → one, cognate with Pers. yek, as below.
Existing as the only one or as the sole example.
From Fr. unique, from L. unicus "single, sole," from unus, → one.
Yektâ "unique," from yek, → one, + tâ "fold, plait, ply; piece, part" (Mid.Pers. tâg "piece, part").
The state or condition of being → unique.
Noun from → unique.
Fr.: théorème d'unicité
1) Physics: A → potential that satisfies both
→ Poisson's equation and the
→ boundary conditions
pertinent to a particular field is the only possible potential.
yekâ (#), yekân (#)
A quantity or dimension adopted as a standard of measurement.
Back formation from → unity.
Yekâ, yekân, from yek, → one.
Fr.: vecteur unité
A vector of length 1, also called a direction vector.