The condition that two or more functions are indistinguishable because they have the same values at a finite set of points. Such functions are said to be aliases of each others. The aliasing problem often occurs in undersampled discrete Fourier transform.
Anyâyi, from anyâ, → alias, + noun forming suffix -i.
1) In a → planispheric astrolabe,
the small revolving rod fixed to the center of
the goniometric scale plotted on the → front
or → back of the instrument.
Unlike the → rule,
the alidade has little vanes with holes or slots at each
end, called → pinnules, which are used as sights,
through which the observer can aim at a particular object. An index, often consisting of
the edge of the alidade itself, shows on the goniometric scales the
angle between the line of sight of the targeted object and a
predetermined axis, i.e. the vertical of the observation locality
(online museo galileo, VirtualMuseum).
M.E. allidatha, alhidade, from L. alhidada, from Ar.
Ezâdé, from Ar. al-'izâda.
bigâné (#), bigân
Fr.: 1) espèce envahissante; 2) extraterrestre
1) A species not native to its environment; an introduced species.
M.E., from O.Fr. alien "strange, foreign; a stranger, foreigner," from L. alienus "of or belonging to another, foreign, alien, strange," also, as a noun, "a stranger, foreigner," adjectival form of alius "(an)other," → alias; meaning "not of the Earth" first recorded 1920.
Bigâné "alien, foreigner," from Mid.Pers. bêgânag, from bêg-, bê- "out, outside, apart" (cf. Sogd. bêk "out, outside, apart, except," bêk-dênê "heretic," literally "out of religion") + suffix -ânag.
To arrange in a line or so as to be parallel; to adjust to produce a proper relationship or orientation.
M.Fr. aligner, from O.Fr. aligner, from à "to" + ligner "to line," from L. lineare, from linea "linen thread, string, line;" → line.
Âxatidan, from â- intesive and nuance prefix + xat, → line, + infinitive suffix -idan.
align a telescope
âxatidan-e durbin, ~ teleskop
Fr.: aligner un télescope
Setting the axis of a telescope parallel to prime directions. In equatorial mounting, they are made parallel with the Earth's axis of rotation and the equator respectively. → collimation.
Arranged in a → straight line.
Past participle of → align.
aligned magnetic field
meydân-e meqnâtisi-ye âxatidé
Fr.: champ magnétique aligné
A magnetic field whose lines of force are oriented along a particular direction or by a particular manner (axially, vertically; randomly, properly, etc.)
The fact of being in line or bringing into line.
Alioth (ε Ursae Majoris)
The brightest of the seven stars that make up the → Big Dipper → asterism. Alioth shines at magnitude +1.77 from a distance of about 80 → light-years. It is a white star of → spectral type A0pCr. The spectrum of the star is characterized by abnormally strong lines of → chromium and → europium.
Alioth, from Aliot, from Ar. Alyat (
Jown, from Ar. Jawn "black camel or horse".
Alkaid (η Ursae Majoris)
The second brightest star in → Ursa Major and the end star in the handle of the → Big Dipper. Alkaid is a blue B3V main sequence star of apparent magnitude of 1.86 and lies at about 100 → light-years.
Alkaid "leader, chief," from Al-Qa'id al-Banat an-Na'ash "the leader of the daughters of the bier," from Banat "daughters" + Na'ash "bier". Banat an-Na'ash is the Ar. name of the constellation.
Qâed from Ar. Al-Qa'id.
A substance that dissolves in water to give hydroxide ions. A generic name for → bases.
M.E. alkaly, from M.fr. alcali, M.L. alkali, from Ar.
Qalyâ, loan from Ar., as above.
Fr.: raie alcaline
A spectral line produced by an → alkali metal.
felez-e qalyâyi (#)
Fr.: métal alcalin
Any of the chemical elements belonging to group A of the → periodic table, which burn vigorously in air; i.e. → lithium, → sodium, → potassium, → rubidium, → cesium, and → francium. Alkali metals have a → valence of one and are softer and less dense than other metals.
From alkal(i) + -ine a suffix denoting "of or pertaining to," "of the nature of," "like."
From qalyâ, → alkali, + -yi adj. suffix.
alkaline earth metal
felez-e qalyâyi-ye xâki (#)
Fr.: terre alcaline
Any of the metallic chemical elements belonging to group 2 of the → periodic table; i.e. → beryllium, → magnesium, → calcium, → strontium, → barium, and → radium. They are not found free in the nature because they are highly reactive.
Fr.: tout, tous
The whole quantity or amount.
M.E. al, plural alle; O.E. eall "all, every, entire;" cf. O.Fris., O.H.G. al, O.N. allr, Goth. alls.
Hamé- "all," variant hami "all the time, always;" Mid.Pers. hamâg "all," hamê "all the time, always;" Av. hama- "any;" cf. Skt. sama-"any, every, whichever;" Gk. amo-then "whichever;" Goth. sums "any;" O.N. sumr "any;" O.E. sum "some;" E. some.
Fr.: relevé sur tout le ciel
1) The act of allying or state of being allied; the result of this action.
1) General: To assign or allot for a particular purpose.
From M.L. allocate imperative plural of allocare "allocate," from → ad- "to" + locare "to place," from locus "a place."
Teskidan, from tesk "portion, share, part, lot; a tax upon lands, tribute extracted," variants tešk, toxs (kardan) "distribute, divide;" loaned in Ar. tisq, tasq; tasu "a weight of four barley corns; the twenty-forth part of a weight;" Mid.Pers. tasû "the fourth part," loaned in Ar. tassûj, in Syriac tassûgâ "the fourth part; a measure;" ultimately Proto-Ir. *caçû-ka-; cf. Av. caθwarô, catur-, → four.
The act of allocating; the state of being allocated.
Verbal noun of → allocate.