simile

The story starts in ancient Latium with Latin similis, meaning "like" or "resembling." By the 1st century BCE, Roman writers were using related forms for comparison in both law and literature. The adjective could become a noun when context made the comparison itself the point. That habit opened the way for a technical rhetorical term.

In late classical and early medieval Latin, simile was used as a noun for a likeness or comparison. Teachers of rhetoric and Bible commentators used it when naming figures of speech. The form stayed close to ordinary Latin grammar, which is why it still looks Latin in English. Its learned feel is not an accident but a survival.

English took simile into print in the late 14th century in scholarly and literary settings. The word entered through the language of grammar, preaching, and commentary rather than everyday speech. It kept its Latin spelling because educated writers recognized it as a classroom term. That preserved form helped distinguish it from simple like and as.

Today simile names a comparison that says one thing is like another. It remains a schoolroom word, but its roots are older than the classroom itself. What began as a plain statement of resemblance became a precise label in poetics. The history is simple because the word itself was built to say "similar."