Sloleks is the reference morphological lexicon for Slovenian language, developed to be used in NLP applications and language manuals. Encoded in LMF XML, the lexicon contains approx. 100.000 most frequent Slovenian lemmas, their inflected or derivative word forms and the corresponding grammatical description. Lemmatization rules, part-of-speech categorization and the set of feature-value pairs follow the JOS morphosyntactic specifications. In addition to grammatical information, each word form is also given the information on its absolute corpus frequency and its compliance with the reference language standard.