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  • WordNet 3.6
    • n quadrant a measuring instrument for measuring altitude of heavenly bodies
    • n quadrant the area enclosed by two perpendicular radii of a circle
    • n quadrant any of the four areas into which a plane is divided by two orthogonal coordinate axes
    • n quadrant a quarter of the circumference of a circle
    • ***
Webster's Revised Unabridged Dictionary
    • Quadrant An instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90°, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction.
    • Quadrant (Anal. (Geom) One of the four parts into which a plane is divided by the coördinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant.
    • Quadrant The fourth part; the quarter.
    • Quadrant (Geom) The quarter of a circle, or of the circumference of a circle, an arc of 90°, or one subtending a right angle at the center.
    • ***
Century Dictionary and Cyclopedia
    • n quadrant The fourth part; the quarter.
    • n quadrant The quarter of a circle; the arc of a circle containing 90°; also, the figure included between this arc and two radii drawn from the center to each extremity; the division of angular magnitude from zero to a right angle, or 90°.
    • n quadrant An astronomical instrument for measuring altitudes, of ancient origin, and consisting of a graduated arc of 90°, with a movable radius carrying sights, or the quadrant, carrying sights, might turn about a fixed radius. Picard in 1669 substituted a telescope for the sights, and Flamsteed (1689) introduced spider-lines in the focal plane of the object-glass. The quadrant was superseded by the mural circle, and this by the meridian circle.
    • n quadrant An instrument of navigation, for measuring the altitude of the sun, distinctively called the reflecting quadrant. It was invented by Thomas Godfrey of Philadelphia in 1730, whence called Godfrey's bow, and perhaps independently by Hadley, an instrument-maker of London, about the same time. Among Hadley's papers after his death was found a description of a similar instrument by Newton, of earlier date. The quadrant is now nearly superseded by the sextant.
    • n quadrant An instrument used in giving a cannon or mortar the angle of elevation necessary to the desired range. In the older forms it has a graduated arc, and a plumb-line which indicates the angle of elevation upon the arc. In a more finished and accurate form a spirit-level is substituted for the plumb, and one of the branches of the instrument is pivoted and slides over the face of the arc so as to show the elevation. Also called gunners' quadrant and gunners' square.
    • n quadrant In electricity, a name suggested for the practical unit of self-induction. Its value is 10 centimeters.
    • quadrant Four-sided; square.
    • quadrant Square.
    • n quadrant In embryology, one of the four blastomeres or cleavage-cells in the four-cell stage of the ovum.
    • n quadrant A square or one of its sides.
    • n quadrant An oscillating arm attached to a spinning-mule to give a proper rotation to the spindles during the winding of the yarn on the cop.
    • ***
Chambers's Twentieth Century Dictionary
    • n Quadrant kwod′rant (geom.) the fourth part of a circle, or an arc of 90°: an instrument used in astronomy for the determination of angular measurements: an instrument of navigation for measuring the altitude of the sun
    • ***


Webster's Revised Unabridged Dictionary
L. quadrans, -antis, a fourth part, a fourth of a whole, fr. quattuor, four: cf. F. quadrant, cadran,. See Four, and cf. Cadrans
Chambers's Twentieth Century Dictionary
L. quadrans, from quatuor, four.


In literature:

Each of the four parts is called a quadrant, and each quadrant has 90 degrees.
"Practical Mechanics for Boys" by J. S. Zerbe
He had purchased a compass and quadrant, and obtained a chart of his intended course.
"The History of Tasmania, Volume II (of 2)" by John West
I asked him if he could use the quadrant.
"Old Jack" by W.H.G. Kingston
Quadrant of a circle, 50.
"Mechanical Drawing Self-Taught" by Joshua Rose
The quadrant was got ready.
"The Voyages of the Ranger and Crusader" by W.H.G. Kingston
North, second quadrant, that meant.
"The Planet Strappers" by Raymond Zinke Gallun
The quadrants and circles of Bird, Cary and Ramsden were unapproached abroad.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
Returning to the western side of the quadrant represented in Lunar Chart No.
"Pleasures of the telescope" by Garrett Serviss
It was dark in the quadrant toward the marsh and red in the quadrant toward the town.
"Smugglers' Reef" by John Blaine
Later on, these actions of the Quadrant will be carefully examined.
"The Story of the Cotton Plant" by Frederick Wilkinson
A giant ball now, filling all that quadrant of the heavens.
"Astounding Stories of Super-Science, March 1930" by Various
The figures marked on the quadrant give the latitude of the ship at the moment of meridian.
"Due South or Cuba Past and Present" by Maturin M. Ballou
Exceedingly nice women were then to be met in the Quadrant from eleven to one in the morning, and three till five in the afternoon.
"My Secret Life, Volumes I. to III." by Anonymous
The first root after zero is thus in the third quadrant, corresponding to m = 1.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various
No, this quadrant of the State of Harrison was not subjected to such a violent disturbance.
"A Republic Without a President and Other Stories" by Herbert Ward
Bartholomew sprang from his seat a second later, but his blouse caught in the teeth of the quadrant.
"The Nerve of Foley" by Frank H. Spearman
The quadrant, though under charge of a sentinel, had been stolen by the adroitness of some of the natives.
"Blackwood's Edinburgh Magazine, Volume 59, No. 368, June 1846" by Various
AS'TROLABE, an instrument formerly used for taking the altitude of the sun or stars, now superseded by the quadrant and sextant.
"The New Gresham Encyclopedia. Vol. 1 Part 2" by Various
She'd even begun practicing how to take latitude with the quadrant.
"Caribbee" by Thomas Hoover
Petyr just came in from the North Quadrant.
"Project Daedalus" by Thomas Hoover

In poetry:

"Oh, and if the quadrant has lost a hand,
And the sextant falls so low,
It's our bodies and bones to Davy Jones
This night are bound to go!"
"A Sailor's Yarn" by James Jeffrey Roche
"Oh, what does the quadrant indicate,
And how does the sextant stand?"
"Oh, the sextant's down to the freezing point,
And the quadrant's lost a hand!"
"A Sailor's Yarn" by James Jeffrey Roche
Compass, quadrant and sextant contrive
No farther tides . . . High in the azure steeps
Monody shall not wake the mariner.
This fabulous shadow only the sea keeps.
"At Melville's Tomb" by Harold Hart Crane
The greatest for its greatness is half known,
Stretching beyond our narrow quadrant-lines,--
As in that world of Nature all outgrown
Where Calaveras lifts his awful pines,
And cast from Mariposa's mountain-wall
Nevada's cataracts fall.
"Shakespeare" by Oliver Wendell Holmes

In news:

Analyst Firm Positions Everbridge in Leaders Quadrant .
Just this week the TSSAA released its midseason look at possible playoff groupings, where teams are placed in quadrants based on location.
Claas of America's Quadrant 3300 Rectangular Baler.
Gartner's Magic Quadrant Disses Amazon Cloud.
In its Magic Quadrant for Business Process Management Suites report, Gartner highlights several new tools that clients can use to evaluate clients.
Self-Storage's The BSC Group Forms Financing Alliance With Quadrant Financial Inc. December 3, 2010 Comments.
Complete details for Fifth Quadrant .
45-year-old man with left-upper- quadrant abdominal pain.
Quadrant HealthCom Buys IMNG From Elsevier.
Vernier throttle quadrant for sim now available.
A wise physician in the northeast quadrant of the country once commented that a doctor would do well to speak Spanish, act British, and think Yiddish .
Loaded playoff quadrants not fair.
It's in a quiet quadrant in her home.
First place teams in each quadrant automatically qualify for the state tournament and do not have to play until then.
Flexibility for quadrant and full-arch dentistry.

In science:

The refinement subgrid is the upper left quadrant in each case.
Multiscale Gaussian Random Fields for Cosmological Simulations
The character of the two parts is strikingly different within the refinement subvolume (the upper left quadrant).
Multiscale Gaussian Random Fields for Cosmological Simulations
We shall consider pairs (T, φ), where T is a finite rooted tree, φ is a mapping of the set vertices V (T ) of the tree to the positive quadrant of the plane, denote φ(v) = (b = b(v), p = p(v)) for v ∈ V (T ).
Gibbs and Quantum Discrete Spaces
This also implies that at least one pair of opposite quadrants has combined probability less than 2β .
Random Surfaces
Vattulainen et al. generated N random walks of length w and counts how often the walker ends in each of the four quadrants of the lattice.
Pseudo Random Coins Show More Heads Than Tails
R and center in the origin of coordinate system, lying respectively in the first and in the fourth quadrant of complex plane α, R ≫ 1.
Fundamental Solutions in Plane Problem for Anisotropic Elastic Medium Under Moving Oscillating Source
Suppose the square of down spins is placed in the first quadrant of the xy plane such that the bottom left corner of the square coincides with the origin of the coordinate system.
Domains and Interfaces in Random Fields
It is clear that it suffices to prove unimodality for the half-quadrant where x ≥ 0 and y ≤ x.
Simulating a Random Walk with Constant Error
Thus, b0 ≥ 0 and our spectral sequence is a first quadrant spectral sequence.
Generalized Harish-Chandra modules with generic minimal $\frak k$-type
In the example we will construct, Nef(a• ) is the third quadrant and Eff(a• ) = R2 .
Cones and Asymptotic Invariants of Multigraded Systems of Ideals
Nef(c• ) is the third quadrant, so it is described by linear functions.
Cones and Asymptotic Invariants of Multigraded Systems of Ideals
We observe that in the first quadrant of (m, n)-space the ideal c(m,n) is generated by all mononmials xv where v is a lattice point in mP ∩ nQ.
Cones and Asymptotic Invariants of Multigraded Systems of Ideals
By the construction of R it suffices to show this on the first quadrant.
Cones and Asymptotic Invariants of Multigraded Systems of Ideals
We may also assume that ω occupies the first quadrant of the coordinate system iOj .
The Limiting Distribution of the Trace of a Random Plane Partition
The four-quadrant phase-mask coronagraph. I. principle.
Coronographic Methods for the Detection of Terrestrial Planets