Math.: A permutation of a set of elements that interchanges two elements and
leaves the remaining elements in their original positions.
For example, the swapping of 2 and 5 to take the list 123456 to 153426 is a transposition.
Fr.: élément transuranien
An element beyond uranium in the periodic table, with atomic number greater than 92. Such elements do not occur in nature, but may be obtained by suitable nuclear reactions. They are all radioactive and members of the actinide group.
A line that cuts across two or more lines. A transversal cutting two lines generates eight angles, four lying between the two lines, four external to the two lines.
From L. transversus "turned or directed across," p.p. of transvertere "to turn across," from → trans- + vertere "to turn," cognate with Pers. gardidan "to turn, to change;" Mid.Pers. vartitan; Av. varət- "to turn, revolve;" Skt. vrt- "to turn, roll," vartate "it turns round, rolls;" O.H.G. werden "to become;" PIE base *wer- "to turn, bend."
Tarâgozar, from tarâ-→ trans- + gozar "passage, transit, passing," from gozaštan "to pass, cross, transit," variant gozâštan "to put, to place, let, allow;" Mid.Pers. widardan, widâštan "to pass, to let pass (by);" O.Pers. vitar- "to pass across," viyatarayam "I put across;" Av. vi-tar- "to pass across," from vi- "apart, away from" (O.Pers. viy- "apart, away;" Av. vi- "apart, away;" cf. Skt. vi- "apart, asunder, away, out;" L. vitare "to avoid, turn aside") + O.Pers./Av. tar- "to cross over;" → trans-.
Fr.: jauge transverse
Same as the → Coulomb gauge.
Fr.: masse transverse
In special relativity theory, the mass when the acceleration of a body is perpendicular to its velocity: mt = m0 / [1 - (v/c)2]1/2, where m0 is the → rest mass, v is the velocity, and c the → velocity of light. The transverse mass is identical to the → relativistic mass. See also → longitudinal mass.
Fr.: vitesse transverse
Same as → tangential velocity.
Fr.: onde transversale
A wave in which the vibration or displacement takes place in a plane at right angles to the direction of propagation of the wave; e.g. electromagnetic radiation. → longitudinal wave.
transverse Zeeman effect
oskar-e Zeeman-e tarâgozar
Fr.: effet Zeeman transverse
The → Zeeman effect when observed at right angles to the orientation of the magnetic field. Un un-displaced line is observed along with a doublet, three lines in all, with the frequencies ν and ν ± Δν. The two displaced components correspond to a plane of → polarization parallel to the external magnetic field and the un-displaced line to a plane of polarization perpendicular to this field. → longitudinal Zeeman effect.
A four-sided plane figure, no two sides of which are parallel.
L.L. trapezium, from Gk. trapezion "irregular quadrilateral," literally "a little table," diminutive of trapeza "table," from shortening of *tetrapeza, from → tetra- "four" + peza "foot, edge," related to pous, podos, Pers. pâ, → foot.
Zuzanaqé, loan from Ar. dhuzanaqat.
Fr.: amas du Trapèze
A star cluster located in the center of the → Orion Nebula whose four brightest stars form the vertices of a trapezoid. They are known as θ1 Ori A, B, C, and D and are of magnitude 6.7, 8.0, 5.1, and 6.7 respectively. They are packed in an area 22 arcseconds across (10,000 A.U.). The Trapezium stars are responsible for the illumination of the entire Orion Nebula. The principal and the most massive star of the group is θ1Ori C, a young main sequence → O star of type O6. The three others are → B stars. Almost all of the Trapezium stars are multiple: the most massive star θ1Ori C is double, the next massive star θ1Ori A is triple, θ1Ori B is at least quadruple, and θ1Ori D is apparently single.
1) A tall, woody perennial plant usually with a single trunk.
M.E., from O.E. treo, treow "tree, wood," from P.Gmc. *trewan (cf. O.S. trio, O.N. tre, Goth. triu), from PIE *deru- "wood" (cf. Mod.Pers. dâr "tree;" O.Pers. dāruv- "wood;" Av. dāuru- "piece of wood, tree trunk;" Skt. dāru- "tree, wood;" Gk. drus "tree;" Serb. drvo "tree;" L. larix "larch tree;" Rus. drevo "tree, wood;" Pol. drwa "wood;" Lith. derva "pine wood;" O.Ir. daur, Welsh derwen "oak").
Deraxt "tree;" Mid.Pers. draxt "tree," two possible etymologies. A suffixed variant of dâr "tree," cognate with E. tree, as above. Alternatively, from Av. *draxta- "firmly stood, fixed" (as in handraxta-), from drang-, dranj- "to fix, fasten, strengthen, hold," dražaite "holds," infinitive drājnhe; cf. Khotanese drys- "to hold;" Sogdian drγ- "to hold;" Parthian Mid.Pers. drxs "to endure."
Fr.: structure en arborescence
A type of → data structure in which each element is attached to one or more elements in a hierarchical manner. Trees are often called inverted trees because they are normally drawn with the root at the top.
A graphical representation that displays a hierarchical view of data.
A general tendency, course, or direction.
From M.E. trenden "to roll about, turn, revolve," from O.E. trendan, (cf. O.E. trinde "round lump, ball," O.Fris. trind, M.L.G. trint "round," M.L.G. trent "ring, boundary," Du. trent "circumference," Dan. trind "round").
Ravâl, from row present stem of raftan "to go, walk, proceed" (Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack") + suffix -âl, → -al.
In medieval astronomy, a spurious oscillatory motion of the equinoxes thought to have a period of 7,000 years. This concept, attributed to Thâbit ibn Qurra (c. 830-901), had a profound influence on medieval astronomy. In order to explain trepidation, Thâbit was said to have added a new sphere to the eight Ptolemaic spheres beyond the sphere of fixed stars.
From L. trepidationem "agitation, trembling," from trepidare "to tremble, hurry," from trepidus "anxious, scared;" cf. Skt. trprá- "hasty;" PIE base *trep- "to shake, tremble."
Larzeš, verbal noun of larzidan "to tremble, shiver;" Mid.Pers. larzidan "to shake, tremble;" Manichean Mid.Pers. rarz- "to shiver with fever;" Proto-Iranian *rarz- "to shake, tremble."
1) tarâraft; 2) tarâraftan
Fr.: 1) entrée non autorisée; 2) pénétrer sans autorisation
An unlawful act causing injury to the person, property, or rights of
another, committed with force or violence, actual or implied.
→ light trespass.
sebar (#), seguš (#)
Sebar "three-sided," from sé, → three, +
+ bar "side; breadth; breast,"
variant var (Mid.Pers. var "breast;"
Av. vouru "wide, broad, extended" (vourucašāni- "looking far"),
related to varah- "breast;" cf. Skt. urú- "wide, broad,"
úras- "breast;" Gk. eurus "wide, broad;"
PIE base uer-, ueru-s"wide, broad").
Fr.: inégalité triangulaire
In surveying and navigation, the process of deriving the linear distance between any two remote points by the division of a large area into adjacent triangles and using trigonometric relationships.
From M.L. triangulation-, from triangulare "to make triangles," → triangle.
Sebar-bandi, from sé, → three, + bandi verbal noun from bastan "to form, bind, tie" (Mid.Pers. bastan/vastan "to bind, shut;" Av./O.Pers. band- "to bind, fetter," banda- "band, tie;" cf. Skt. bandh- "to bind, tie, fasten;" Ger. binden; E. bind; PIE base *bhendh- "to bind").