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from what you say it is a sensor with some added electronics so that it can perform a specicif functio. like you said a termistor with some circuits to make it linear, or a temperature sensor that has a sensor, mesuring circuit and a AD converter all in one package.
bogdan ... that's the way I've seen the term used by people who are selling or otherwise describing electronic systems. I've seen some with electronics (presume microprocessor) that allow field programming for range, time delay, etc. I guess it's a way to differentiate between the traditional dumb sensor. Like other terminology it may also be misapplied too.
ok, i think i can help.
i checked my electronics dictionary and it says that it is a sensor that alco contains a microprocessor that processes thae data taken from the sensible element and and then it is send to the output. so you are correct.