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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1 The dried Cetaphil will smother the lice. 2  Leave it on your child's hair for at least 8 hours. 3  In the morning, wash off the Cetaphil with a regular shampoo. 4  To cure your child of lice, REPEAT this process twice in 1 and 2 weeks.