The word peculiar has quite a peculiar etymology! The Oxford English Dictionary shows it as first cropping up in the middle of the fifteenth century, and etymologists have concluded that it was borrowed directly from Latin peculiaris, which meant "one's own property". The current definition of "unusual" arose because peculiar things were considered to be special attributes of a specific person or thing, just like property is owned by a particular person. Peculiaris comes from the noun peculium, which meant "private property" but more literally could be interpreted as "property in cattle", because a lot of wealth was measured in livestock back then. The root is pecus, or "cattle", and that, through an earlier form sounding like peku, derives from Proto-Indo-European peku, with the same meaning.
Hello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy philosophy, trivia, vexillology, geography, board games, conlanging, art history, and law.