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extraneous

[ɪkˈstreɪniəs]

adj. having no relevance; coming from the outside; not forming an essential part

A keystone being placed at the top of a great stone arch

This decision is extraneous to the future of the entire organization.

"Less Is More" by Relient K

Eliminating the extraneous means removing what is irrelevant and unnecessary.

extra-“” extraordinary adj. extracurricular adj.