\input zb-basic \input zb-ioport \iteman{io-port 05981856} \itemau{Paulo-Santos, Ant\'onio; Ramos, Carlos; Marques, Nuno C.} \itemti{Determining the polarity of words through a common online dictionary.} \itemso{Antunes, Luis (ed.) et al., Progress in artificial intelligence. 15th Portuguese conference on artificial intelligence, EPIA 2011, Lisbon, Portugal, October 10--13, 2011. Proceedings. Berlin: Springer (ISBN 978-3-642-24768-2/pbk). Lecture Notes in Computer Science 7026. Lecture Notes in Artificial Intelligence, 649-663 (2011).} \itemab Summary: Considerable attention has been given to polarity of words and the creation of large polarity lexicons. Most of the approaches rely on advanced tools like part-of-speech taggers and rich lexical resources such as WordNet. In this paper we show and examine the viability to create a moderate-sized polarity lexicon using only a common online dictionary, five positive and five negative words, a set of highly accurate extraction rules, and a simple yet effective polarity propagation algorithm. The algorithm evaluation results show an accuracy of 84.86\% for a lexicon of 3034 words. \itemrv{~} \itemcc{} \itemut{lexicon generation; polarity lexicon; polarity of words} \itemli{doi:10.1007/978-3-642-24769-9\_47} \end