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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The only agents approved by the FDA for treatment of pediculosis are topical ivermectin lotion, lindane, and malathion. Tea tree oil has been promoted as a treatment for head lice; however, evidence of its effectiveness is weak.he only agents approved by the FDA for treatment of pediculosis are topical ivermectin lotion, lindane, and malathion. Tea tree oil has been promoted as a treatment for head lice; however, evidence of its effectiveness is weak.