Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- v. To discover with certainty, as through examination or experimentation. See Synonyms at discover.
- v. Archaic To make certain, definite, and precise.
Century Dictionary and Cyclopedia
- To make certain; determine; define or reduce to precision by removing doubt, obscurity, or ambiguity; establish; prove.
- To find out by trial, examination, or experiment, so as to know as certain; acquire an accurate knowledge of: as, to ascertain the weight of a commodity or the purity of a metal.
- To make sure of; insure.
- To make certain or sure; certify; assure; inform.
- To establish with certainty; render invariable, or not subject to caprice; fix.
Wiktionary
- v. To find out definitely; to discover or establish.
GNU Webster's 1913
- v. obsolete To render (a person) certain; to cause to feel certain; to make confident; to assure; to apprise.
- v. Archaic To make (a thing) certain to the mind; to free from obscurity, doubt, or change; to make sure of; to fix; to determine.
- v. To find out or learn for a certainty, by trial, examination, or experiment; to get to know.
WordNet 3.0
- v. find out, learn, or determine with certainty, usually by making an inquiry or other effort
- v. establish after a calculation, investigation, experiment, survey, or study
- v. be careful or certain to do something; make certain of something
- v. learn or discover with certainty
Etymologies
- From Old French acertener, from (a- ("to, towards") + certener ("make sure of"), from the adjective certain. (Wiktionary)
- Middle English acertainen, to inform, from Old French acertener, ascertain- : a-, to (from Latin ad-; see ad-) + certain, certain; see certain. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“I was able to ascertain from the News forum that there's at least one Telcel shop in Alamos.”
“Separate and distinct from all the preceding categories of signing statement, and apparently even more controversial than any of them, is the use of such statements to create legislative (or "executive") history that is expected to be given weight by the courts in ascertain the meaning of statutory language.”
“This we can ascertain from the frames in Scene 3, where UN troops are present.”
“Before any claim is paid under the Act or these Regulations the war agency considering the claim shall notify the General Accounting Office as to the proposed settlement, and the General Accounting Office shall ascertain from the contracting and lending agencies of the Government whether they have any claims against the claimant and shall notify the agency concerned with respect thereto.”
“Russell has directed a Cabinet to be summoned for to-morrow at three o'clock, at which he intends to propose that "Instructions should be sent to Lord Granville to ascertain from the French Government what terms France would consider satisfactory for the immediate arrangement of the affairs of the East.”
“All Indian citizens intending to travel to the People's Republic of China are advised that before making any travel arrangements they should first ascertain from the Chinese Embassy or Consulate, as the case may be, whether the visa being issued to them will be affixed to the passport or will be in the nature of a stapled paper visa, so that they are not inconvenienced or put to any financial loss later on this count," the advisory said.”
“Frantic phone calls ascertain that "Somebody forgot to press a key," when I signed on, and so my payment did not go through.”
The Guardian: Diary of a tenant: No money, no food and no phone credit
“The force of the enemy in number of men, at the commencement of the action, was no doubt considerably greater than we have been able to ascertain, which is upwards of 400 men.”
The Medallic History of the United States of America 1776-1876
“This reminds me of a particular episode of the great Canadian sketch comedy program the Kids in the Hall, 'in which' one dude uses the word 'ascertain' like his mind were stuck on rails.”
In which Max discovers a tic, Arnold Kling | EconLog | Library of Economics and Liberty
“He wanted to "ascertain" and "fix" it at the point now reached in his pronouncements upon it, his receptions and rejections, and to keep it fixed there indefinitely.”
Lists
These user-created lists contain the word ‘ascertain’.
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Test Prep or Just for fun
Building a list for standardized test prep or just for learning some new words! Please add any words that you feel are important for the SAT/GRE/GMAT etc...
throng, morass, parley, facile, kismet, strife, jetsam, carrion, annex, harbinger, vestige, surreptitious and 575 more...
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GRE 2014
abase, abate, abdicate, aberrant, abeyance, abhor, abjure, abortive, abound, abrasive, abreast, abridge and 1577 more...
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GRE Barrons Wordlist
A complete Barron's Wordlist for GRE preparation. Your online flashcard replacement.
abase, abash, abate, abbreviate, abdicate, aberrant, aberration, abet, abeyance, abhor, abject, abjure and 4087 more...
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gre
municipal, whit, dissembler, berate, liberally, embellish, dissimilitude, histrionics, flamboyance, bombastic, bovine, calumny and 142 more...
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2nd part
prelude, ample, escalate, prototype, accession, acquisition, archives, zealot, indict, verdict, intimidating, timid and 454 more...
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bad memory
copper, anvil, oblique, thrust, shrine, welfare, farewell, bitter, faction, sectarian, tangible, spectacle and 134 more...
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EU Buzz - Lisbon Treaty
All words of the Lisbon Treaty
(Persons' names, foreign and grammatical words have been eliminated, MWEs have been split up into individual words. Capitalization has been retained if r...health, follow, condition, meeting, minister, beginning, chapter, information, language, remain, covered, respect and 2614 more...
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fancy essay words
hiatus, ontology, exegesis, hermeneutics, dialectics, demiurge, ascertain, contention, eschatological, synecdoche, centripetal, centrifugal and 96 more...
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GRE Study guide
Going through the Magoosh website, words I pulled from the verbal section. 2012.
magnanimous, correlate, anglicized, simulacrum, tantamount, obsequiousness, subterfuge, vehement, vociferous, benign, concomitant, veracity and 83 more...
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scholarly writing words
decrement, replete, impel, iterative, subsume, tacit, vex, denote, impart, ascertain, coalesce, extant and 49 more...
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Words To Use In Creative Writing
hag-ridden, light-heeled, wendigo, longshanks, fatuous, insipid, sodden, bulging, sycophantic, uncourtly, gauche, assuasive and 102 more...
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GRE 3500
abase, abash, abate, aberrant, abeyance, abjure, ablution, abut, accede, accentuate, acerbity, acetic and 133 more...
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Words
My list of words.
veritable, facetious, nadir, quixotic, apropos, acquiesce, ostensible, insipid, egregious, inveterate, coax, adroit and 409 more...
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Words I Know
List of most of the words I've learned
garner, abase, abate, abdicate, abduct, aberration, abet, abhor, abide, abject, abjure, abnegation and 1046 more...
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Personal Vocabulary List
All my favourite words that I come across!
veritable, incongruence, rigamorole, letcherous, revolting, repulsive, reputrid, rapatious, forays, guise, placate, paradigm and 1162 more...
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Week 1, Day 1
ignominy, marquee, deter, chariot, stern, perfidy, treacherous, insolent, presumptuous, banish, dubious, livid and 133 more...
Tweets
Looking for tweets for ascertain.

Arthurpod "Under the spell of the river, Covenant became slowly more conscious of the reassuring solidity of the Land. It was not an intangible dreamscape; it was concrete, susceptible to ascertainment."
Lord Foul's Bane Jul 29, 2012
krishanchahal my test run Aug 5, 2009
krishanchahal pta lagana, jaan lena Aug 5, 2009
bencasnocha People never know how to pronounce this word. ASS SIR TAIN Dec 30, 2006