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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3) Cetirazine (Zyrtec). This may be the best antihistamine for eosinophils (one of the primary cell types associated with allergies). It is a formerly prescription only medication that is now available over the counter. Available in: 5mg and 10mg tablets. Dosage: CATS: 5mg Â½ to 1 tablet 1 or 2 times daily.