In this paper, we address the problem of the morphological analysis of an Arabic dialect. We propose a method to adapt an Arabic morphological analyzer for the Tunisian dialect (TD). In order to do that, we create a lexicon for the TD. The creation of the lexicon is done in two steps. The first step consists in adapting a Modern Standard Arabic (MSA) lexicon. We adapted a list of MSA derivation patterns to TD. The second step consists in improving the resulting lists of patterns and roots by using TD specific roots and patterns. The proposed method has been tested and has achieved an Fmeasure performance of 88%.
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