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 we washed her hair, you could see the lice rinsing out. We did this every three days for two weeks to make sure that they were all gone. A. Many readers report that smothering lice with mayonnaise, coconut oil, Listerine or petroleum jelly works better than lice shampoo. In many places, lice have developed resistance to the chemicals in the shampoos. Adding vinegar to the rinse can help loosen nits. All such treatments require persistence.