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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1 Cephalexin, also known by the brand names KeflexÂ® and RilexineÂ®, is an antibiotic used for dogs and cats. 2  Cephalexin belongs to the cephalosporin class of drugs and iis related to the penicillin drugs in how it kills bacteria. cephalosporins have a much broader range of activity against bacteria than penicillins. The usual dose of cephalexin for dogs and cats is 10 to 15 mg per pound (22 to 30 mg/kg) every 8 to 12 hours orally. 2  Reduced dosages are recommended for pets with kidney failure. 3  Should be administered with food if cephalexin causes nausea or vomiting in your pet.