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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When the three minutes is up, take the hair comb and comb the Cetaphil Cleanser out of the hair. Rinse the cleanser out of the comb into a bowl. This will allow you to see the lice and nits you have removed.