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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Cefotaxime is the only cephalosporin which has very low toxicity in plants, even at higher concentration (up to 500 mg/l). It is widely used to treat plant tissue infections with Gram-negative bacteria, while vancomycin is used to treat the plant tissue infections with Gram-positive bacteria.