axiom. 1  a self-evident truth that requires no proof. 2  a universally accepted principle or rule. 3  Logic, Mathematics. a proposition that is assumed without proof for the sake of studying the consequences that follow from it.
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One dose daily to lower and control eye pressure. How TRAVATAN Z Â® Solution Works. TRAVATAN Z Â® (travoprost ophthalmic solution) 0.004% is a once-a-day eye drop you take in the evening to help reduce the elevated pressure inside your eye. It belongs to a class of drugs called prostaglandin analogs. These drugs work by increasing the drainage of fluid inside the eye.