Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Fiat(noun) an authoritative command or order to do something; an effectual decree. 2  Fiat(noun) a warrant of a judge for certain processes. 3  Fiat(noun) an authority for certain proceedings given by the Lord Chancellor's signature.
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I am a doctor, and I can tell you that cephalexin is not the best drug for dental infections. If one is allergic to penicillin, clindamycin would be a better choice. Penicillin is still the drug of choice because it is cheap and effective.