Definition of immaterial:
of no importance or relevance especially to a law case; "an objection that is immaterial after the fact"
without material form or substance; "an incorporeal spirit"
not consisting of matter; "immaterial apparitions"; "ghosts and other immaterial entities"
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"
(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"