Abstrac Name : Muhammad Wiwin Student No. : 1609200080010 Department/Program : English Education/Postgraduate (S2) Title : Morphology of Devayan: A language of Simeulu Keywords: Devayan language, morphology, morphological process. This study aims to investigate the morphological process in Devayan. The method used in this study is descriptive qualitative. Data were obtained from five informants of five villages in sub-district of Teupah Barat. The results of this study were obtained by using open-ended interview technique. The instrument used was an interview guide based on elicitation model of Bowern (2015). Data were analyzed by performing compiling, disassembling or coding, reassembling, interpreting and concluding. The results of this study indicated that Devayan has several types of morphological process, namely affixation which consists of prefixes, infixes, suffixes, and circumfixes. The Devayan prefix consists of non-pronominal prefixes and pronominal prefixes. Non-pronominal prefix consists of {ma-}, {di-}, {mɛʔ-}, {a-}, {ta-} and {sa-}. Pronominal prefix consists of {u-}, {da-}, {mu-}, {ni-}, {ta-}, {mi-} and {mai-} .Infixes of Devayan are {-um-}, {-aʔ-} and {-ŋala-}. The suffixes are {-an} and {-i} (non-pronominal suffix) and {-nɛ}, {-ta}, {-o}, {-mɛ}, {-maʔi} and {-da} (non-pronominal suffixes). Circumfix consists of {ma-an}, {ma-i}, {a-an} and {di-an} and pronominal form; {u-an}, {mu-an}, {ni-an}, {mi-an}, {mi-ni}, {mu-ni}, {da-an}, {da-i}, {mai-an} and {mai-i}. Reduplication forms are complete reduplication, affixed reduplication, partial reduplication, and phonemic transformative reduplication. Compounding consists of compounding of two nouns, compounding of noun and verb, compounding of noun and adjective, compounding of verbs and adjectives, compounding of verbs and nouns, and compounding of adjective and noun and compounding of two verbs, conversion, clipping, borrowing and onomatopoeia processes; sounds of humans, animals and objects. The meanings resulted from the morphological processes are found in affixation which adheres on the base form, reduplication which depends on base types which form it and compounding is to express the figurative word.