etymology
/ eh-tuh-MOL-uh-jee /
Etymology is the life story of a word — where it came from, and how its shape and meaning have drifted over the centuries. Just as your face carries traces of your grandparents, almost every word you say is a worn-down descendant of older words, often in languages no one speaks anymore. To trace a word's etymology is to follow that family tree backward in time.
Words rarely sit still. "Nice" once meant foolish or ignorant; "silly" once meant blessed and happy. "Goodbye" is a squeezed-down "God be with you," said so many millions of times that the prayer inside it wore smooth and vanished. Knowing a word's history lets you feel these hidden currents under everyday speech.
One warning: a word's origin is not its "true" meaning. People sometimes argue that "decimate" must mean "destroy one in ten" because that's what it meant in ancient Rome — but words are defined by how we use them now, not by where they started. Etymology explains the journey; it doesn't lock in the destination.
disaster ← Italian disastro, ultimately from Greek dus- ("bad") + aster ("star"): literally "ill-starred," from the belief that the stars governed fate.
Many everyday words still carry a forgotten worldview folded inside them.
Fittingly, "etymology" is itself etymological: it comes from Greek étymon, the "true or original sense" (from étymos, "true, real"), plus -logia, "study" — the ancients believed every word hid a true, original meaning waiting to be uncovered.