Definitions of immaterial:

• adjective:   (often followed by `to') lacking importance; not mattering one way or the other

  Example: "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

  Example: "An objection that is immaterial after the fact"

• adjective:   not consisting of matter

  Example: "Immaterial apparitions"

• adjective:   not pertinent to the matter under consideration

  Example: "The price was immaterial"

• adjective:   without material form or substance