What does it mean by "one-time deductible"?

[Doctor G]

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What do you guys have for health insurance? How's the plan that Western U offers? Is $648 per plan year worth the money with $150 deductible? (And, what does it mean by "one-time deductible"?) I don't want to spend too much time shopping around for the "best" insurance plans, so, I don't know if it's good to just go for the one offered by Western U.