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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There are indeed over-the-counter treatments for head lice. Luckily, these over-the-counter medications are very effective in treating head lice. Over-the-counter treatments are usually the first treatment choice. The best treatment for children age two years and older is permethrin 1% cream rinse (NixÂ®).