This paper aimed to select the principal meanings and usage of ‘-(n/neun)da’ to be presented and taught in Korean language education. Current Korean language textbooks and grammar books exhibit confusingly different meanings and usages of ‘-(n/neun)da,’ which is attributed to the complexity and variety in meanings and usages of ‘-(n/neun)da’. In Korean language education, ‘-(n/neun)da’ is defined as a declarative sentence final ending of Hera style speech level. However, its use is found in sentences which are not regarded as Hera style and it has functions that cannot be defined as a declarative sentence final ending. Grammatical features for Korean language education should be selected after considering their functions and uses to best facilitate effective teaching and learning. But for grammatical features that are complex and various in meaning and form such as ‘-(n/neun)da’, an analysis into their main definitions and usages should proceed the decision making process that occurs when selecting what should be included in Korean language education. This paper analyzed six Korean language textbooks, four Korean grammar books, and four Korean dictionaries in an attempt to categorize main meanings and usages of the final ending ‘-(n/neun)da’. Regarding whether temporal factors impact the meanings and form of ‘-(n/neun)da’ , this study found that there are relations between the meanings of ‘-(n/neun)da’ and temporal factors which are analyzed within a category of temporal localization or temporal-stability, as delineated by Talmy Givón (1984, 2001) and Yasuo Okuda(1988a). (Hankuk University)