1.Definition: (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)"

Related Adjective(s):indifferent

2.Definition: not consisting of matter

"Immaterial apparitions", "Ghosts and other immaterial entities"

Related Adjective(s):nonmaterial

3.Definition: not pertinent to the matter under consideration

"The price was immaterial"

Related Adjective(s):extraneous, impertinent, orthogonal

4.Definition: of no importance or relevance especially to a law case

"An objection that is immaterial after the fact"

5.Definition: without material form or substance

Related Adjective(s):incorporeal