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Longman Dictionary of Contemporary English
ascertain
verb
COLLOCATIONS FROM CORPUS
■ ADVERB
how
▪ It is up to him to ascertain how far he wishes to travel and by what route.
▪ Readers should ascertain how their own central bank defines money supply.
▪ In particular, more research is needed to ascertain how the voice of the consumer may best be heard.
▪ It was impossible to ascertain how many of the boats moored in the harbour over the weekend were local.
▪ The real difficulty is in each case to ascertain how far such implications extend.
■ NOUN
fact
▪ The simplest inquiry by the hon. Gentleman would have ascertained that fact.
▪ In the Chamber of Deputies a resolution was introduced to make an investigation of the affair to ascertain the facts.
▪ If the complex number c is in the white region, then there is an algorithm for ascertaining that fact.
▪ Gandhi took pains to ascertain all the facts.
▪ If we suspect that this complex number actually lies on the unit circle, we can not necessarily ascertain this fact.
■ VERB
try
▪ We have not yet tried to ascertain the amount of information about government and politics that the respondents actually have.
▪ There are a number of areas where problems are caused in trying to ascertain the appropriate standard of care for the plaintiff.
▪ They tried to ascertain news of the tsar and his family, but to no avail.
▪ If I were interviewing a new act, I would try to ascertain their sheer punishment factor.
▪ He confirmed officers were still trying to ascertain what had been taken.
EXAMPLES FROM OTHER ENTRIES
▪ A doctor should examine the patient to ascertain where the pain is localized.
▪ As far as we have been able to ascertain, our client is not involved in anything illegal.
▪ Read labels to ascertain the amount of fats in processed foods.
▪ The case remains a mystery. The police were never able to ascertain the true facts.
▪ The pathologist ascertained that the victim had died from a gunshot wound.
EXAMPLES FROM CORPUS
▪ Because of the nature of the sample this study could not ascertain the views of residents themselves.
▪ Have you ascertained the strength and consistency of each symptom?
▪ He had previously ascertained that there were at least two aircraft with similar radio fits and noted their positions.
▪ It is not always easy to ascertain the source of a particular item of income.
▪ The reason was that it was not at that time ascertained that those materials were definitely to be used.
▪ Try to ascertain the financing techniques used by your own country in its international transactions with the rest of the world.
▪ Unfortunately, since there are so many possible explanations, the correct one is most difficult to ascertain.
▪ With Bulstrode resigned from the hospital board, Dorothea summons Lydgate for advice and also to ascertain the truth.
The Collaborative International Dictionary
Ascertain

Ascertain \As`cer*tain"\, v. t. [imp. & p. p. Ascertained; p. pr. & vb. n. Ascertaining.] [OF. acertener; a (L. ad) + certain. See Certain.]

  1. To render (a person) certain; to cause to feel certain; to make confident; to assure; to apprise. [Obs.]

    When the blessed Virgin was so ascertained.
    --Jer. Taylor.

    Muncer assured them that the design was approved of by Heaven, and that the Almighty had in a dream ascertained him of its effects.
    --Robertson.

  2. To make (a thing) certain to the mind; to free from obscurity, doubt, or change; to make sure of; to fix; to determine. [Archaic]

    The divine law . . . ascertaineth the truth.
    --Hooker.

    The very deferring [of his execution] shall increase and ascertain the condemnation.
    --Jer. Taylor.

    The ministry, in order to ascertain a majority . . . persuaded the queen to create twelve new peers.
    --Smollett.

    The mildness and precision of their laws ascertained the rule and measure of taxation.
    --Gibbon.

  3. To find out or learn for a certainty, by trial, examination, or experiment; to get to know; as, to ascertain the weight of a commodity, or the purity of a metal.

    He was there only for the purpose of ascertaining whether a descent on England was practicable.
    --Macaulay.

Douglas Harper's Etymology Dictionary
ascertain

early 15c., "to inform, to give assurance," from Anglo-French acerteiner, Old French acertener "to assure, certify" (13c.), from a "to" (see ad-) + certain "certain" (see certain). Modern meaning of "find out for sure by experiment or investigation" is first attested 1794. Related: Ascertained; ascertaining.

Wiktionary
ascertain

vb. To find out definitely; to discover or establish.

WordNet
ascertain
  1. v. after a calculation, investigation, experiment, survey, or study; "find the product of two numbers"; "The physicist who found the elusive particle won the Nobel Prize" [syn: determine, find, find out]

  2. be careful or certain to do something; make certain of something; "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product" [syn: see, check, insure, see to it, ensure, control, assure]

  3. find out, learn, or determine with certainty, usually by making an inquiry or other effort; "I want to see whether she speaks French"; "See whether it works"; "find out if he speaks Russian"; "Check whether the train leaves on time" [syn: determine, check, find out, see, watch, learn]

  4. learn or discover with certainty

Usage examples of "ascertain".

In fact, upon hearing that certain masters were dissecting living nymphs in order to ascertain the cause of their madness, he formally abjured his Profession of Faith and quit the Scientists.

Finally, he points out the practical bearing of the subject--for example, the probability of calculus causing sudden suppression of urine in such cases--and also the danger of surgical interference, and suggests the possibility of diagnosing the condition by ascertaining the absence of the opening of one ureter in the bladder by means of the cystoscope, and also the likelihood of its occurring where any abnormality of the genital organs is found, especially if this be unilateral.

It was ascertained in several cases that this sensitiveness resides in the tip, which transmits an influence causing the adjoining upper part to bend in opposition to geotropism towards the moist object.

The commons appeared determined no longer to brook a delay of the agrarian law, and extreme violence was on the eve of being resorted to, when it was ascertained from the burning of the country-houses and the flight of the peasants that the Volscians were at hand: this circumstance checked the sedition that was now ripe and almost breaking out.

Although it has long been known that pepsin with acetic acid has the power of digesting albuminous compounds, it appeared advisable to ascertain whether acetic acid could be replaced, without the loss of digestive power, by the allied acids which are believed to occur in the secretion of Drosera, namely, propionic, butyric, or valerianic.

I acceded rather reluctantly to the proposition, though at that time I was incapable of ascertaining his intention, which was, after conducting me to a remote part of the structure, to deliver me into the hands of three ruffians, who, having covered me with a veil so thick as to exclude every object from my view, placed me upon a mule, and conveyed me, regardless of my cries, through the deepest recesses of the woods, when, having arrived at a small inn, situated at the extremity of the forest, we stopped without alighting for refreslnnent.

In the morning the royal captive was presented to Alp Arslan, who doubted of his fortune, till the identity of the person was ascertained by the report of his ambassadors, and by the more pathetic evidence of Basilacius, who embraced with tears the feet of his unhappy sovereign.

As soon as the fact was ascertained, seven of them had seceded and had seized upon the forts, arsenals, navy yards, and other public property of the United States within their boundaries, and were making every preparation for war.

It has been ascertained what is the area of the cross section of this stream and the area of the face of the piers, and the engineers say that the piers being put there will increase the current proportionally as the space is decreased.

SIR:--Major-General McClellan telegraphs that he has ascertained by a reconnaissance that the battery at Jamestown has been abandoned, and he again requests that gunboats may be sent up the James River.

In the course of the session I shall probably have occasion to request you to provide indemnification to claimants where decrees of restitution have been rendered and damages awarded by admiralty courts, and in other cases where this government may be acknowledged to be liable in principle and where the amount of that liability has been ascertained by an informal arbitration.

Rivers, and by the populous tribes in New Caledonia, as ascertained by Sir Alexander Mackenzie in his journey to the Pacific.

Clearly we cannot estimate their ethical value until we have learned the modes in which they have actually determined human conduct for good or evil: in other words, we cannot judge of the morality of religious beliefs until we have ascertained their history: the facts must be known before judgment can be passed on them: the work of the historian must precede the work of the moralist.

He had ascertained, through the medium of agents, that the Shah of Persia would, for a sum, of money paid in advance consent to the establishment of military magazines on certain points of his territory.

English commander having, among other things, ascertained that the disasters of Italy were quite unknown to Napoleon, indulged in the malicious pleasure of sending him a file of newspapers.