SubmissionNumber#=%=#10 FinalPaperTitle#=%=#The Role of Adverbs in Language Variety Identification: The Case of Portuguese Multiword Adverbs ShortPaperTitle#=%=# NumberOfPages#=%=#8 CopyrightSigned#=%=# JobTitle#==# Organization#==# Abstract#==#This paper aims to assess the role of multiword compound adverbs in distinguishing Brazilian Portuguese (PT-BR) from European Portuguese (PT-PT). Two key factors underpin this focus: Firstly, multiword expressions often provide less ambiguity compared to single words, even when their meaning is idiomatic (non-compositional). Secondly, despite constituting a significant portion of lexicons in many languages, they are frequently overlooked in Natural Language Processing, possibly due to their heterogeneous nature and lexical range. For this study, a large lexicon of Portuguese multiword adverbs (3,665) annotated with diatopic information regarding language variety was utilized. The paper investigates the distribution of this category in a corpus consisting in excerpts from journalistic texts sourced from the DSL (Dialect and Similar Language) corpus, representing Brazilian (PT-BR) and European Portuguese (PT-PT), respectively, each partition containing 18,000 sentences. Results indicate a substantial similarity between the two varieties, with a considerable overlap in the lexicon of multiword adverbs. Additionally, specific adverbs unique to each language variety were identified. Lexical entries recognized in the corpus represent 18.2% (PT-BR) to 19.5% (PT-PT) of the lexicon, and approximately 5,700 matches in each partition. While many of the matches are spurious due to ambiguity with otherwise non-idiomatic, free strings, occurrences of adverbs marked as exclusive to one variety in texts from the other variety are rare. Author{1}{Firstname}#=%=#Izabela Author{1}{Lastname}#=%=#Müller Author{1}{Username}#=%=#izabela Author{1}{Email}#=%=#a74074@ualg.pt Author{1}{Affiliation}#=%=#Universidade do Algarve Author{2}{Firstname}#=%=#Nuno Author{2}{Lastname}#=%=#Mamede Author{2}{Email}#=%=#Nuno.Mamede@tecnico.ulisboa.pt Author{2}{Affiliation}#=%=#Universidade de Lisboa - Instituto Superior Técnico Author{3}{Firstname}#=%=#Jorge Author{3}{Lastname}#=%=#Baptista Author{3}{Username}#=%=#jbaptis Author{3}{Email}#=%=#jbaptis@ualg.pt Author{3}{Affiliation}#=%=#University of Algarve ========== èéáğö