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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Photos: Apple cider vinegar: What the science says. Apple cider vinegar might help with dandruff, says Jihn, because the acidity could increase the sloughing of the skin on the scalp, and it does have some antifungal properties. But don't turn to it to get rid of head lice.