| ascertain | (verb) be careful or certain to do something; make certain of something | Synonyms: assure, check, control, ensure, insure, see, see to it |
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| (verb) learn or discover with certainty | - |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: check, determine, find out, learn, see, watch |
| (verb) establish after a calculation, investigation, experiment, survey, or study | Synonyms: determine, find, find out |
| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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| ascertained | (adjective) discovered or determined by scientific observation | Synonyms: discovered, observed |
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| cert | (noun) an absolute certainty | - |
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| certain | (adjective) established beyond doubt or question; definitely known | - |
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| (adjective) having or feeling no doubt or uncertainty; confident and assured | Synonyms: sure |
| (adjective) certain to occur; destined or inevitable | Synonyms: sure |
| (adjective) established irrevocably | Synonyms: sealed |
| (adjective) exercising or taking care great enough to bring assurance | Synonyms: sure |
| (adjective) definite but not specified or identified | - |
| (adjective) reliable in operation or effect | Synonyms: sure |
| certainly | (adverb) definitely or positively (`sure' is sometimes used informally for `surely') | Synonyms: for certain, for sure, sure, sure as shooting, sure enough, surely |
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| certainty | (noun) something that is certain | Synonyms: foregone conclusion, sure thing |
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| (noun) the state of being certain | - |
| certifiable | (adjective) capable of being guaranteed or certified | - |
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| (adjective) fit to be certified as insane (and treated accordingly) | Synonyms: certified |
| certificate | (noun) a document attesting to the truth of certain stated facts | Synonyms: certification, credential, credentials |
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| (noun) a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends | Synonyms: security |
| (verb) authorize by certificate | - |
| (verb) present someone with a certificate | - |
| certificated | (adjective) furnished with or authorized by a certificate: | - |
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| certification | (noun) the act of certifying or bestowing a franchise on | Synonyms: enfranchisement |
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| (noun) validating the authenticity of something or someone | Synonyms: authentication |
| (noun) confirmation that some fact or statement is true through the use of documentary evidence | Synonyms: corroboration, documentation |
| (noun) a document attesting to the truth of certain stated facts | Synonyms: certificate, credential, credentials |
| certificatory | (adjective) serving to certify or endorse authoritatively | - |
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| certified | (adjective) endorsed authoritatively as having met certain requirements | - |
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| (adjective) fit to be certified as insane (and treated accordingly) | Synonyms: certifiable |
| (adjective) holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill | Synonyms: qualified |
| certify | (verb) provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes | Synonyms: attest, demonstrate, evidence, manifest |
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| (verb) declare legally insane | - |
| (verb) guarantee payment on; of checks | - |
| (verb) guarantee as meeting a certain standard | Synonyms: endorse, indorse |
| (verb) authorize officially | Synonyms: licence, license |
| certiorari | (noun) a common law writ issued by a superior court to one of inferior jurisdiction demanding the record of a particular case | Synonyms: writ of certiorari |
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| certitude | (noun) total certainty or greater certainty than circumstances warrant | Synonyms: cocksureness, overconfidence |
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| concert | (noun) a performance of music by players or singers not involving theatrical staging | - |
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| (verb) settle by agreement | - |
| (verb) contrive (a plan) by mutual agreement | - |
| concerted | (adjective) involving the joint activity of two or more | Synonyms: conjunct, conjunctive, cooperative, united |
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| concertina | (noun) free-reed instrument played like an accordion by pushing its ends together to force air through the reeds | - |
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| (noun) coiled barbed wire used as an obstacle | - |
| (verb) collapse like a concertina | - |
| concertinist | (noun) a person who plays the concertina | - |
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| concertise | (verb) give concerts; perform in concerts | Synonyms: concertize |
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| concertize | (verb) give concerts; perform in concerts | Synonyms: concertise |
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| concerto | (noun) a composition for orchestra and a soloist | - |
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| decertify | (verb) cause to be no longer approved or accepted | Synonyms: derecognise, derecognize |
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| disconcert | (verb) cause to lose one's composure | Synonyms: discomfit, discompose, untune, upset |
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| (verb) cause to feel embarrassment | Synonyms: confuse, flurry, put off |
| disconcerted | (adjective) having self-possession upset; thrown into confusion | Synonyms: discombobulated |
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| disconcerting | (adjective) causing an emotional disturbance | Synonyms: upsetting |
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| disconcertingly | (adverb) in a disturbing or embarrassing manner | - |
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| disconcertion | (noun) anxious embarrassment | Synonyms: discomfiture, discomposure, disconcertment |
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| disconcertment | (noun) anxious embarrassment | Synonyms: discomfiture, discomposure, disconcertion |
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| incertain | (adjective) lacking or indicating lack of confidence or assurance | Synonyms: uncertain, unsure |
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| incertitude | (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, uncertainty |
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| lacertid | (noun) Old World terrestrial lizard | Synonyms: lacertid lizard |
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| lacertilian | (adjective) of or relating to lizards | Synonyms: saurian |
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| preconcerted | (adjective) previously arranged or agreed on | - |
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| unascertainable | (adjective) not able to be ascertained; resisting discovery | Synonyms: undiscoverable |
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| uncertain | (adjective) not established beyond doubt; still undecided or unknown | - |
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| (adjective) lacking or indicating lack of confidence or assurance | Synonyms: incertain, unsure |
| (adjective) not certain to occur; not inevitable | - |
| (adjective) not established or confirmed | Synonyms: unsealed |
| (adjective) ambiguous (especially in the negative) | - |
| (adjective) not consistent or dependable | - |
| (adjective) subject to change | Synonyms: changeable, unsettled |
| uncertainly | (adverb) showing lack of certainty | - |
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| (adverb) in an unsteady manner | Synonyms: falteringly, unsteadily |
| uncertainness | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainty |
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| uncertainty | (noun) being unsettled or in doubt or dependent on chance | Synonyms: precariousness, uncertainness |
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| (noun) the state of being unsure of something | Synonyms: doubt, doubtfulness, dubiety, dubiousness, incertitude |
| uncertified | (adjective) lacking requisite official documentation or endorsement | - |
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