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  • WordNet 3.6
    • adj challengeable capable of being challenged
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Seven asteroids were especially named for the Challenger astronauts who were killed in the 1986 failed launch of the space shuttle
    • a Challengeable That may be challenged.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: In Washington D.C. it is illegal to post a notice in public which calls another person a 'coward' for refusing to accept a challenge to duel.
    • challengeable Capable of being challenged, or called to an account.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: The term "throw one's hat in the ring" comes from boxing, where throwing a hat into the ring once signified a challenge. Today it nearly always signifies political candidacy.
    • adj Challengeable that may be challenged
    • ***


  • Marcel Proust
    “A powerful idea communicates some of its strength to him who challenges it.”
  • Peter F. Drucker
    “Knowledge has to be improved, challenged, and increased constantly, or it vanishes.”
  • Viktor E. Frankl
    Viktor E. Frankl
    “Challenging the meaning of life is the truest expression of the state of being human.”
  • Mary Ann Allison
    Mary Ann Allison
    “Hire the best. Pay them fairly. Communicate frequently. Provide challenges and rewards. Believe in them. Get out of their way and they'll knock your socks off.”
  • Amelia Earhart
    Amelia Earhart
    “Women must try to do things as men have tried. When they fail their failure must be but a challenge to others.”
  • Cleveland Amory
    Cleveland Amory
    “A supreme social challenge.”


Chambers's Twentieth Century Dictionary
O. Fr. chalenge, a dispute, a claim—L. calumnia, a false accusation—calvi, calvĕre, to deceive.


In literature:

This seemed like a challenge.
"The Watchers of the Trails" by Charles G. D. Roberts
It responded not to challenge, and visual contact obscene horror showed.
"Fearful Symmetry" by Ann Wilson
An old word for to challenge, or incite to emulation; still in full use.
"The Sailor's Word-Book" by William Henry Smyth
In 1808 challenged Humphrey Marshall, and fired three times at his breast.
"Robert Toombs" by Pleasant A. Stovall
Whom are you about to challenge?
"Her Mother's Secret" by Emma D. E. N. Southworth
This was an out and out challenge to him to strike her.
"The Huntress" by Hulbert Footner
They've sent us a challenge.
"The Hero of Garside School" by J. Harwood Panting
They will bring their own wares, and challenge a trial: they want nothing but to name the judges.
"A Budget of Paradoxes, Volume II (of II)" by Augustus de Morgan
And you need not stop, if challenged.
"The Boy Scout Automobilists" by Robert Maitland
Jaime passed by the forge, staring at the Ironworker, giving a look of challenge which the other seemed not to understand.
"The Dead Command" by Vicente Blasco Ibáñez
His voice carried the suggestion of a challenge.
"The White Mice" by Richard Harding Davis
In the course of it, Pantauchus challenged Pyrrhus to single combat.
"Pyrrhus" by Jacob Abbott
We two, at any rate, are not challenging fate by feeling too secure.
"The Lonely Way--Intermezzo--Countess Mizzie" by Arthur Schnitzler
Helen halted as she came abreast of the table, and her dancing eyes challenged her sister.
"The Law-Breakers" by Ridgwell Cullum
They awaited only the specific challenges before they would be transformed into inalienable rights.
"The Road to Independence: Virginia 1763-1783" by Virginia State Dept. of Education
Again and again the city was called upon to defend the challenge which her riches and massive walls perpetually issued.
"Carmen Ariza" by Charles Francis Stocking
He would not, though, meet the challenge.
"The Missourian" by Eugene P. (Eugene Percy) Lyle
The challenge is accepted.
"Some Essentials of Religion" by J. C. Roper
Washington was resolved to provoke it by a kind of challenge.
"The Student's Life of Washington; Condensed from the Larger Work of Washington Irving" by Washington Irving
The American promptly accepted the challenge.
"The Greater Republic" by Charles Morris

In poetry:

New hands the wires of song may sweep,
New voices challenge fame;
But let no moss of years o'ercreep
The lines of Halleck's name.
"Fitz-Greene Halleck" by John Greenleaf Whittier
Hence though the law condemn at large,
It can lay nothing to my charge;
Nor find such ground to challenge me,
As Heaven hath found justify.
"The Believer's Riddle; or, the Mystery of Faith" by Ralph Erskine
Haste! The brave steed, leaping lightly,
'Neath his double burden sprightly,
Challenges, with scornful note,
Every horse in Pharaoh's boat.
"Lita of the Nile" by Richard Doddridge Blackmore
His state-craft was the Golden Rule,
His right of vote a sacred trust;
Clear, over threat and ridicule,
All heard his challenge: "Is it just?"
"Sumner" by John Greenleaf Whittier
'Tis the Philistine,
Proclaiming by his herald, through the ranks,
His near approach. Each morning he appears
His challenge to our bands.
"David And Goliath. A Sacred Drama" by Hannah More
And as the Epic lifts a form sublime
For all the Ages on its plinth of gold,
So does our Story, challenging all time,
Its crowning shape uphold!
"Arms And The Man - Heroes And Statesmen" by James Barron Hope

In news:

Huawei Challenges the iPhone With the Ascend D. Skype disables password reset after security flaw exposed.
America's Ultimate Challenge: The Pikes Peak Ascent (McKenzie Martin).
They call it America's Ultimate Challenge and I have to admit they are right.
CTFA Preservative Challenge and Stability Testing Survey.
Landmark Accord Could Challenge US Influence in Southeast Asia by 2010.
The Abnormal Situation Management ( ASM ) Consortium recently gathered for a quarterly meeting to discuss challenges faced by plant operators.
Tracking down ancestors is a rewarding challenge.
Scholars Challenge Author's Assertion That 1960s Activist Worked for FBI.
Paraguay action film thrills and challenges.
Schwannomas of the nasal septum are extremely rare, and therefore their diagnosis and treatment can pose certain challenges.
Driving down St Bernard Avenue between Filmore and Robert E Lee is a challenge.
A metric century is a 100 kilometer cycling event that is done for fun and challenge 100km events are just about the perfect distance to start as a great cycling challenge.
In fact, both skin care professionals—who lament the challenges of treating hyperpigmented skin—and clients—who suffer through years of unsuccessful attempts at eliminating it—are challenged by this condition.
Finances, youth, energy, environment, land use are interwoven challenges Mayor Pat Burt outlines city priorities, challenges during the annual.
Jordanian charter operator Rayajet has placed firm orders with Bombardier for a Challenger 300 and one of the larger Challenger 605s.

In science:

Thus it is a challenging open problem to define four manifold invariants beyond Donaldson-Witten or Seiberg-Witten invariants.
Higgs Bundles and Four Manifolds
While we have seen that the matching parameter y (α) and the kernel-size parameter z (α) are well understood and closely related, the exact evaluation of vertex cover parameter x(α) remains as a challenge.
Core percolation in random graphs: a critical phenomena analysis
Modelling the universe presents some new challenges for the applied mathematician or theoretical physicist different from those in other areas of the mathematical modelling of physical phenomena.
Is Nature Generic?
The challenge faced by Einstein and his colleagues was to mount an argument built directly on the orthodox quantum principles themselves.
Quantum theory and the role of mind in nature
The study of such hard instances represent a theoretical challenge towards a concrete understanding of complexity and the analysis of algorithms.
Phase coexistence and finite-size scaling in random combinatorial problems
We are challenged to develop a method for sampling multiscale Gaussian random fields consistent with the multiresolution sampling of mass.
Multiscale Gaussian Random Fields for Cosmological Simulations
The ma jor technical challenge of our algorithm is to perform the convolution of equation (14) without storing or summing over the entire Fourier space.
Multiscale Gaussian Random Fields for Cosmological Simulations
Our challenge is to compute the transfer functions on the subgrid without performing an FFT of size (rM )3, under the assumption that the problem is too large to fit in the available computer memory.
Multiscale Gaussian Random Fields for Cosmological Simulations
We present three solutions to this challenge.
Multiscale Gaussian Random Fields for Cosmological Simulations
I thank my colleagues in the Grand Challenge Cosmology Consortium — J. P.
Multiscale Gaussian Random Fields for Cosmological Simulations
Networks pervade all science [1,2] making the problem of understanding the structure and dynamics of complex networks the greatest challenge today.
Access time of an adaptive random walk on the world-wide Web
Experimental study of neutrino properties and interactions with matter is a challenge for low energy physics.
Status of the Experiment on the Laboratory Search for the Electron Antineutrino Magnetic Moment at the Level mu_nu < 3 s 10^{-12}mu_B
Understanding the interplay between quantum statistical and dynamic effects represents the challenging task to achieve both experimentally and theoretically in these quantum many-body systems.
Helium nanodroplets and trapped Bose-Einstein condensates as prototypes of finite quantum fluids
The front-end device to be coupled to the pixel sensors must satisfy several challenging requirements.
Performance of prototype BTeV silicon pixel detectors in a high energy pion beam
Since the order-parameter function P (x, z, y ) depends on three variables, the solution of the self-consistent equation (14) and the evaluation of (16)-(18) pose a formidable challenge.
Metastable configurations of spin models on random graphs