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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2 doctors agreed: Lice: There are many  natural treatments for lice, including olive oil and a tight shower cap. I am not aware of the coconut oil and vinegar remedy but it does not sound dangerous as long as the vinegar does not get in your eyes. Lice is very contagious however, so do not wait to long if this remedy does not work , buy rid.