ascertain

v. clarify, verify, confirm

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Verb
1. 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"
(synonym) determine, find, find out
(hyponym) gauge
(verb-group) determine, check, find out, see, watch, learn
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"
(synonym) see, check, insure, see to it, ensure, control, assure
(hypernym) verify
(hyponym) proofread, proof
(verb-group) determine, check, find out, see, watch, learn
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"
(synonym) determine, check, find out, see, watch, learn
(hyponym) test
(verb-group) see, check, insure, see to it, ensure, control, assure
4. learn or discover with certainty
(hypernym) learn, hear, get word, get wind, pick up, find out, get a line, discover, see
(hyponym) price

v. zjistit

Czas. stwierdzać; upewniać się (co do czegoś)

(v. t.)
To render (a person) certain; to cause to feel certain; to make confident; to assure; to apprise.
  

(v. t.)
To make (a thing) certain to the mind; to free from obscurity, doubt, or change; to make sure of; to fix; to determine.
  

(v. t.)
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.