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Meaning of subject matter

sub'ject mat"ter

Pronunciation: [key]
  1. the substance of a discussion, book, writing, etc., as distinguished from its form or style.
  2. the matter that is subject to some action.
  3. the matter out of which a thing is formed.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.