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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Best Answer: We've found tea-tree oil is good for keeping lice & ticks away. You can usually buy it at the chemist or health food store. Make up a spray bottle of diluted with water tea-tree mixture and lightly spray over yourself (including hair) & pets. It is perfectly safe & natural.