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 There are few infections where cephalosporins are the antibiotics of first choice and their use should be avoided when other more narrow spectrum antibiotics remain effective. 2  Ceftriaxone is an appropriate first line treatment for gonorrhoea, pelvic inflammatory disease and epididymo-orchitis.