A wordnet is an important tool for developing natural language processing applications for a language, but the manual creation of such a resource limits its development. This dissertation studied the automatic construction of Onto.PT, a large Portuguese wordnet, aiming to minimise the main limitations of existing Portuguese wordnets. On this context, we propose ECO, an approach for creating wordnets automatically from text - relation instances are extracted, synonymy clusters (synsets) are discovered, and the remaining relations are then attached to suitable synsets. This document also reports on the contents of Onto.PT, its comparison to other wordnets, and its evaluation.
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