To determine whether a linguistic variety is a language or a dialect is a complex issue involving many aspects of both linguistic and sociolinguistic factors. In this study, we aim to provide a more objective basis for the distinction between languages and dialects. Quantitative approaches are used to explore the boundary between languages and dialects in terms of the degree of difference of language per se. For this purpose, the doculects in ASJP database are taken as the object and normalized Levenshtein distances are computed between language variants. Based on the findings obtained from computation, we propose that the value of LDN=0.48 can be used as the cut-off value to distinguish languages and dialects. In addition to what are described in this study, Ethnologue’s overdifferentiation and underdifferentiation between languages and dialects are discussed in this paper.
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