Vice is a noun meaning bad behavior, but it’s also an adjective referring to an official who is second in command. Karen, a seventh- and eighth-grade history teacher in Waco, Texas, says her students wonder why. These two senses of vice come from two separate Latin words: vice, meaning in place of, and vitium, meaning fault or blemish. The two English descendants of these words ended up being spelled exactly the same way, even though they mean completely different things. This is part of a complete episode.