WordWeb Online

1. Not pertinent to the matter under consideration
   "the price was immaterial";
   - extraneous, impertinent, orthogonal
    
2. (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";
   - indifferent
    
3. Of no importance or relevance especially to a law case
   "an objection that is immaterial after the fact"
    
4. Without material form or substance
   "an immaterial spirit";
   - incorporeal
    
5. Not consisting of matter
   "ghosts and other immaterial entities"; "immaterial apparitions";
   - nonmaterial

See also: beside the point, bodiless, corporality, corporeality, discorporate, disembodied, insubstantial, intangible, irrelevant, materiality, nonphysical, physicalness, spiritual, unbodied, unembodied, unimportant, unreal, unsubstantial

Antonym: material

Encyclopedia: Immaterial