Longman Dictionary of Contemporary English homepage

immaterial

 adjective
     
im‧ma‧te‧ri‧al
1 not important in a particular situation [= irrelevant]:
If you sign a document, it is wholly immaterial whether you have read it carefully or not.
2 formal not having a physical body or form:
our immaterial soul
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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