noun
a person or thing that is not in a straight line or course
adjective
not consisting of or bounded by a straight line or lines
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The nonliner nature of the data made it difficult to analyze using traditional statistical methods.
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I can't make sense of this nonliner graph, it's so confusing.
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This nonliner stuff is way over my head, I don't get it at all.
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The nonliner plot of the movie kept me on the edge of my seat, never knowing what would happen next.