#1 immaterial a. [incorporeal] without material form or substance; "an incorporeal spirit". wn
#2 immaterial a. [nonmaterial] not consisting of matter; "immaterial apparitions"; "ghosts and other immaterial entities". wn
#3 immaterial s. [extraneous, impertinent, orthogonal] not pertinent to the matter under consideration; "an issue extraneous to the debate"; "the price was immaterial"; "mentioned several impertinent facts before finally coming to the point". wn
#4 immaterial s. [indifferent] (often followed by 'to') lacking importance; not mattering one way or the other; "whether you choose to do it or not is a matter that is quite immaterial (or indifferent)"; "what others think is altogether indifferent to him". wn
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