Definition of "nonperturbative" [nonperturbative]

• Beyond the scope of perturbation theory (adjective)

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• "Just to be clear, the 8+ years I mentioned is what I often see for people working on non-string formal particle theory topics such as nonperturbative QCD (e.g. Schwinger-Dyson equations and that kind of stuff)."
• "“Just to be clear, the 8+ years I mentioned is what I often see for people working on non-string formal particle theory topics such as nonperturbative QCD (e.g. Schwinger-Dyson equations and that kind of stuff).”"
• "Mark wrote: However, baryon number is violated at the quantum level through nonperturbative processes - it is an anomalous symmetry."