IPA: /nɒnˌɪntəˈsɛktɪŋ/
KK: /nɑnˈɪntərˌsɛktɪŋ/
Not crossing or meeting at any point.
The two lines on the graph are nonintersecting, meaning they will never cross each other.
Nonintersecting → It is formed from "non-" (meaning not) and "intersecting" (from "inter-" meaning between and "secare" meaning to cut). The word describes lines or paths that do not cut across each other, hence they do not intersect.
Think of 'not' ('non-') cutting across each other ('intersecting') — that's why nonintersecting means they do not meet.