This study aims to find and explain the types of inflectional affixes in the Uab Meto language and their meanings. The Uab Meto language consists of two types, namely Uab Meto cluster L and R with their respective distribution areas and uses by their speakers. The object of this study is the Uab Meto language cluster L used in South Central Timor Regency, East Nusa Tenggara Province. The research is focused in Bijaepunu Village, North Molo District, South Central Timor Regency. This study uses morphological theory by Aronoff & Fudeman (2011). The research approach used is a qualitative descriptive approach. Data collection methods refer to the listening and speaking methods with their respective techniques. The data is obtained used the observation and interlocution method. The data is collected by interviewing and recording directly from native speakers of the Uab Meto language cluster L who live in Bijaepunu Village. In this study, three types of inflectional affixes were found and all three function as suffixes. The three types of inflectional suffixes, namely the inflectional suffixes /-n/, /-in/, and /-sin/ which are found in use in the basic lexemes of nouns and verbs. The results of the analysis of the three types of inflectional suffixes /-n/, /-in/ and /-sin/ in the Uab Meto language cluster L show a plural grammatical meaning when added to the basic lexeme and accompanied by omissions and phoneme shifts. The grammatical meaning of the inflectional suffixes /-n/, /-in/ and /-sin/ when added to the basic lexeme of nouns, explains that the object referred to is more than one and when added to verbs, explains actions that are done more than once or repeatedly.