Isogloss

An isogloss is a geographic boundary that separates areas where different linguistic features, such as dialects or words, are used. For example, if one region calls a soft drink "soda" and another calls it "pop," an isogloss would mark the line between these two terms. Isoglosses help linguists understand how language varies by location, reflecting cultural and social influences. They can involve not just vocabulary but also pronunciation and grammar, providing insights into the way language evolves and how communities communicate.