The branch of physics that deals with the properties and phenomena of electromagnetic radiation in the wavelength range extending from the ultraviolet (at about 40 nm) to the far-infrared (at 1 mm) and with vision.
Optics, from optic, from M.Fr. optique, from M.L. opticus "of sight or seeing," from Gk. optikos "of or having to do with sight," from optos "seen, visible," from op-, root of opsesthai "be going to see," related to ops "eye," from PIE *okw- "eye; to see" (→ eye); → -ics.
One that minimizes or maximizes some quantity or combination of quantities, such as time, energy, distance, path, etc.
Optimal, adj. of → optimum.
The fact of optimizing. The condition of being optimized.
Verbal noun of → optimize
behinidan, behin sâxtan
General: To make as effective, perfect, or useful as possible.
Behinidan, from behin, → optimum, + -idan infinitive suffix. Behin sâxtan compound verb from behin + 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").
In computer science, a program that optimizes the speed or resource utilization. → optimize.
Agent noun of → optimize.
The best or most favorable point, degree, amount, etc. The greatest degree or best result obtained or obtainable under specific conditions.
From L. optimum, neuter singular of optimus "best" (used as a suppletive superlative of bonus "good").
Behiné, from behin superlative of beh "good, fine" (Mid.Pers. veh "better, good;" O.Pers. vahav-, vahu-; Av. vah-, vohu- "good;" cf. Skt. vasu- "good;" Hittite wasu-; Gaulish vesus "good") + -in superlative suffix + -é nuance suffix.
opteš, goziné (#)
1) The power or right of choosing.
Left to one's choice; not required or mandatory (Dictionary.com).
Any of various instruments for measuring refractive errors of the eye.
From opto- "vision; eye; optis," combining form from Gk. optos "seen, visible," from opsesthai "be going to see," related to ops "eye;" → -meter.
A → conjunction word used to indicate alternatives.
M.E., from or, adverb "early, before," from Old Norse ār akin to O.E. ær "early."
Yâ, from Mid.Pers. ayâb, aviâp "or;" cf. P.Pers. ada, Av. adā, aδa "then."
1) A globose berry with a yellowish to reddish-orange rind and a sweet edible pulp.
M.E., from O.Fr. orange, orenge, from M.L. pomum de orenge, from It. arancia, originally narancia, alteration of Ar. nâranj, from Pers. nârang, from Skt. narangah "orange tree."
Nârenji, from nârenj "orange," as above.
The path followed by a body moving in a gravitational field. For bodies moving under the influence of a centrally directed force, without significant perturbation, the shape of the orbit must be one of the conic section family of curves (circle, ellipse, parabola, or hyperbola).
L. orbita "wheel track, course, circuit."
Madâr, from Ar.
Fr.: déclin d'orbite
A gradual change in the orbit of a spacecraft caused by aerodynamic drag of a planet's outer atmosphere and other forces.
1) madâri; 2) madârâl
Fr.: 1) orbital; 2) orbitale
1) Of or relating to an orbit.
orbital angular momentum
jonbâk-e zâviyeyi-ye madâri
Fr.: moment cinétique orbital, ~ angulaire ~
1) Mechanics: The → angular momentum
associated with the motion of a particle about an origin, equal to the cross product
of the position vector (r) with the linear momentum (p = mv):
L = r x p. Although r and p are constantly changing
direction, L is a constant in the absence of any external force on the system.
Also known as orbital momentum.
Fr.: axe orbital
Fr.: débris spatial
Objects in orbit around Earth created by humans, that no longer serve any useful purpose. They consist of everything from entire spent rocket stages and defunct satellites to explosion fragments, paint flakes, dust, and slag from solid rocket motors, and other small particles. Also called space junk and space waste.
elektron-e madâri (#)
Fr.: électron orbital
An electron contained within an atom which may be thought of as orbiting around the nucleus, in a manner analogous to the orbit of a planet around the Sun.
Fr.: élément orbital
Any of the six parameters needed to specify the → orbit of an object around a → primary body (such as a planet around the Sun or a satellite around the Earth) and give its position at any instant. Two of them define the size and the form of the orbit: → semi-major axis (a) and → eccentricity (e). Three angular values determine the orbit position in space: the → inclination (i) of the object's → orbital plane to the reference plane (such as the → ecliptic), the → longitude of ascending node (Ω), and the → argument of periapsis (ω). And finally the sixth element is the → time of periapsis passage which allows calculating the body's position along the orbit at any instant.
Fr.: énergie orbitale