etymology

The Greek noun etymologia appeared in the Hellenistic world from etymon, meaning the true or real sense of a word, plus -logia, a branch of study or discourse. That base etymon came from etymos, "true," a reminder that ancient word-study was tied to questions of correctness. Greek grammarians in the centuries before and after 1 CE used the term for tracing words back to their supposed original sense. The word started as an inquiry into truth before it became the history of words.

Latin took over the form as etymologia by late antiquity. Marcus Terentius Varro had already written on word origins in the 1st century BCE, and Isidore of Seville made etymologia famous in the early 7th century CE through his Etymologiae. In Latin learning, the term was not just technical; it was part of grammar, scripture, and encyclopedic explanation. The form stayed close to the Greek original while moving west through schools and monasteries.

Old French and Anglo-French passed it on as ethimologie and related spellings in the 12th and 13th centuries. English borrowed it in the late 14th century as etimologie and then etymology, with spelling reshaped by renewed contact with Latin and Greek. The learned y marked the classical ancestry more clearly than the earlier i spellings did. By the Renaissance, the modern spelling had settled into scholarly English.

The meaning also narrowed and sharpened over time. Ancient writers could use the term for explanations that were moral, rhetorical, or speculative, but modern linguistics tied etymology to documented sound change and attested history. What began as a search for a word's true meaning became the disciplined history of a word's form and sense. The old idea of truth stayed in the roots even after the method changed.