Definition
Diachrony is the study of how something changes over time. 🤓 In linguistics, it's how language evolves. Think of it as looking at the historical timeline of a word or grammar rule. It contrasts with synchronic analysis (a snapshot in time). While synchrony is a single frame, diachrony is the whole movie. It's used in linguistics, history, and other fields. It traces the evolution of things. It is like studying the ripples made by a stone dropped in a pond.