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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Tea tree oil with lavender was found to prevent some blood feeding by lice on the skin. Tea tree oil was, individually, the most effective treatment, but none of the treatments were determined to be effective enough to endorse.