| 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 |
| certificate | (verb) authorize by certificate | - |
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| (verb) present someone with a certificate | - |
| 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 |
| concert | (verb) settle by agreement | - |
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| (verb) contrive (a plan) by mutual agreement | - |
| concertina | (verb) collapse like a 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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| 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 |