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 and peppermint appeared to be most useful for repelling lice. Tea tree oil and lavender were also found to prevent some feeding by lice on treated skin. While the results show some promise, the investigators concluded that none of the treatments were effective enough to endorse. Advertisement.