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what does passive interest mean

The word 'interest' has lots of meanings including: as a verb, 1. excite the curiosity of; engage the interest of; 2. be on the mind of; 3. be of importance or consequence; and as a noun, 1. a sense of concern with and curiosity about someone or something; 2. a reason for wanting something done; 3. the power of attracting or holding one's attention (because it is unusual or exciting etc.); 4. a fixed charge for borrowing money; usually a percentage of the amount borrowed; 5. (law) a right or legal share of something; a financial involvement with something.