Dialectology is a sub-field of linguistics, the scientific study of linguistic dialect. It studies variations in language based primarily on geographic distribution and their associated features (as opposed to variations based on social factors, which are studied in sociolinguistics, or variations based on time, which are studied in historical linguistics). Dialectology treats such topics as divergence of two local dialects from a common ancestor and synchronic variation. Dialectologists are ult… (More on Dialectology)