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1) The exercise of authority or power in a burdensome, cruel, or unjust manner.
M.E. oppressioun, from O.Fr. opresser "oppress; torment," from M.L. oppressare, from L. opprimere "press against, press down;" from op, variant of ob "against" + premere "to press, hold fast."
Setam, from Mid.Pers. sthmbk / stambag / "oppressive; obstinate," related to sitabr "strong, firm," staft "hard; firm, strong; fierce," Pers. seft "firm, hard, tight;" sitanbah "strong, robust, bold;" Av. aša.stəmbana- "having the support/firmness of aša;" Lith stembti "to oppose;" Gk. astemphes "unshakable."
Fr.: aberration optique
Fr.: illusion d'optique
A perception of visual stimuli in which what is perceived is in a way different from the way it is in reality. Same as visual illusion.
optical transfer function (OTF)
karyâ-ye tarâvaž-e nuri
Fr.: fonction de transfert optique
The function that provides a full description of the imaging quality of an optical system. A combination of the → modulation transfer function (MTF) and the → phase transfer function (PTF) , the OTF describes the spatial (angular) variation as a function of spatial (angular) frequency.
The fact of optimizing. The condition of being optimized.
Verbal noun of → optimize
opteš, goziné (#)
1) The power or right of choosing.
Left to one's choice; not required or mandatory (Dictionary.com).
Fr.: inclinaison orbitale
An → orbital element that defines the angle between the orbital plane of a solar system body (planet, comet, asteroid) and the plane of the ecliptic. The orbital inclination of the Earth's orbit is 0°; those of Mercury, Venus, and Mars are 7.01°, 3.39°, and 1.85° respectively.
Fr.: migration orbitale
Theoretical prediction according to which a → giant planet, formed in the outer regions of a → protoplanetary disk, could migrate inward by losing → energy and → angular momentum as the result of → gravitational interactions with the remnants of the disk. This orbital migration could explain the presence of giant gaseous Jupiter-like planets (→ hot Jupiters) very close to their host stars.
Fr.: précession orbitale
Same as → relativistic precession.
ordinary differential equation
hamugeš-e degarsâneyi-ye šunik
Fr.: équation différentielle ordinaire
1) The act or process of organizing.
M.E. organizacion, from M.L. organization-, from organizatus p.p. of organizare "organize" + -ate.
Sâzmân, from sâz present stem of sâxtan, sâzidan
"to build, make, fashion; to adapt, adjust, be fit" (from
Mid.Pers. sâxtan, sâz-, Manichean Parthian s'c'dn "to prepare,
to form;" Av. sak- "to understand, to mark,"
sâcaya- (causative) "to teach") + -mân verbal noun suffix
used with present and past stems, as in zâymân, câymân;
1) su (#); 2) sudahi (#); suyâbi (#)
1) The position in relation to a specific place or object.
Verbal noun of → orient.
Šekârgar (#), Orion (#)
The Hunter. A prominent constellation, one of the largest in the sky, located on the celestial equator around 5h 30m right ascension, 0° declination. This constellation is rich in bright stars and nebulae. The brightest star is Rigel (β Orionis), visual magnitude 0.2. The second brightest star is → Betelgeuse (α Orionis), magnitude between 0.2 and 1.0. A key feature of Orion's constellation is his Belt of three bright stars that form a nearly straight line across its central parts. It contains also the → Orion Nebula, the only region of massive star formation visible to the unaided eye.
In Gk. mythology, Orion was a giant hunter and the enemy of Artemis the huntress, who according to some tales was responsible for his death. Other stories, though, tell how he pursued the Pleiades and with them was turned into a constellation to chase them forever across the sky.
Šekârgar, "→ hunter."
bâzu-ye Šekârgar, ~ Orion
Fr.: bras d'Orion
A minor → spiral arm of the → Milky Way Galaxy close to which the → Sun is located. It is some 3,500 → light-years across and approximately 10,000 light-years in length. The solar system lies close to the inner rim of this spiral arm, about halfway along its length. Its name derives from the fact that the stars closest to the Sun which actually lie within the arm are in the constellation → Orion. Its other designations are → Local Arm, → Local Spur, → Orion Bridge, → Orion Spur, and → Orion-Cygnus Arm.
âhazeš-e Šekârgar, ~ Orion
Fr.: association d'Orion
mile-ye Šekârgar, ~ Orion
Fr.: barre d'Orion
A part of a → molecular cloud toward the → Orion Nebula viewed edge-on. It is the surface of interaction between the → H II region and its → associated molecular cloud. Same as the → Orion Bright Bar.
Fr.: pont d'Orion
Same as → Orion Arm.
Orion Bright Bar
mile-ye deraxšân-e Šekârgar, ~ ~ Orion
Fr.: barre brillante d'Orion
A prominent emission ridge in the → Orion Nebula located approximately 2' southeast of the → Trapezium cluster. Various observations have suggested that it is an escarpment in the main → ionization front of the Nebula seen almost edge-on. The Orion Bar is one of the nearest and best-studied → photodissociation regions.
Orion correlation theory
negare-ye hambâzâneš-e Oryon
Fr.: théorie de la corrélation d'Orion
A controversial proposition according to which a coincidence would exist between the mutual positions of the three stars of → Orion's Belt and those of the main Giza pyramids. More specifically, Khufu, Khafre, and Menkaure would be the monumental representation of → Alnitak, → Alnilam, and → Mintaka, respectively.