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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If I ever have to deal with mites, I am going to try a more natural approach. This study mentions that the use of garlic juice can significantly help in the treatment of lice and mites. Fill a spray bottle with 10% garlic juice and 90% water.