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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You may be considering using tea tree oil as a lice treatment. If so, you might also be wondering what kind of dosage to use. The Mayo Clinic states that there is no particular dose that has been proven to be effective for treating lice.