material (ma·tir´·e·el) n. 1 That of which anything is composed or may be constructed.  2 Collected facts, impressions, ideas, etc., for use in completing a creative endeavor. 3 More interested in material things than in spiritual ones.  4 Important; significant: It makes no material difference to me.  5 Pertaining to matter as opposed to form. [<L materia matter]

interest (in'·ter·ist) n. 1 A feeling of attraction or curiosity about something. 2 The power to excite or hold such a feeling. 3 Something bringing about this feeling: a man of many interests. 4 Often pl. That which is of advantage or profit. 5 Payment made for the use of money; also the money so paid, usu. a percentage of the amount borrowed. 6 Something added in repaying:  to return a blow with interest. 7 A right or share in something, esp. a business enterprise. 8 The persons involved in an industry, cause, etc.: the oil interest. 9 Importance: a story of little interest. 10 Power to procure favor or regard; influence - [<L interesse lie between, be important]