Definition of "Immaterial" :

adjective: not consisting of matter

"Immaterial apparitions."

adjective: without material form or substance

adjective: (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)."

adjective: of no importance or relevance especially to a law case

"An objection that is immaterial after the fact."

adjective: not pertinent to the matter under consideration

"The price was immaterial."