Evaluating Arabic WordNet Ontology by expansion of Arabic queries using various retrieval models

The growing demands on the Arabic language analysis in the computing field highlights the importance of Arabic information retrieval systems in particular, such as search engines, and it´s gaining more interest. One way of enhancing the effectiveness of any information retrieval system is adopted via incorporating query expansion techniques. In this paper, Arabic query expansion is performed by using Arabic WordNet Ontology, and the whole work is evaluated to expose how beneficial is it comparing to the English WordNet Ontology. In fact the medicinal corpus doesn´t show much benefit in the Arabic expansion in any of evaluation measures implemented, which are system´s precision and recall.