Both Uses

immaterial
in
Hard Times
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Fact, fact, fact, everywhere in the material aspect of the town; fact, fact, fact, everywhere in the immaterial.†
Chpt 1.5 *
Would you have robbed me — for no one's enrichment — only for the greater desolation of this world — of the immaterial part of my life, the spring and summer of my belief, my refuge from what is sordid and bad in the real things around me, my school in which I should have learned to be more humble and more trusting with them, and to hope in my little sphere to make them better?'†
Chpt 2.12

Definitions:

(1) (immaterial as in: immaterial to the problem at hand)
not important, or not relevant to the matter at hand

"Immaterial" is a commonly heard objection to introducing evidence or an argument in court.
(2) (meaning too rare to warrant focus)
not having physical substance