When English speakers adopted the word trivial from Latin trivialis in the 16th century, they used it to mean just what its Latin ancestor meant: "found everywhere, commonplace." But the source of trivialis is about something more specific: trivium, from tri- (three) and via (way), means "crossroads; place where three roads meet." The link between the two presumably has to do with the commonplace sorts of things a person is likely to encounter at a busy crossroads. Today, the English word typically describes something barely worth mentioning. Such judgments are, of course, subjective; feel free to mention this bit of trivia to anyone and everyone who crosses your path.

Trivial comes from a Latin word meaning "crossroads"—that is, where three roads come together. Since a crossroads is a very public place where all kinds of people might show up, trivialis came to mean "commonplace" or "vulgar." Today the English word has changed slightly in meaning and instead usually describes something barely worth mentioning. Mathematicians use the word to refer to the mathematically simplest case, but the rest of us tend to use it just to mean "unimportant." "Small talk" at a party, for example, is usually trivial conversation. To trivialize something is to treat it as if it doesn't matter, as if it is just another triviality.