When the word anomaly was first borrowed into English in the 1570s, it meant something more like "unevenness" than its modern definition, but it was an easy extension from there to a connotation of "deviation from the ordinary" that developed in the 1660s. Before then, the word came from Latin anomalia, which came from Greek anomalos, which essentially had the same meaning. Here it gets interesting as we break apart anomalos into two: the prefix an- means "not" and the root homalos means "even", so an anomaly is, etymologically, "uneven". Homalos is from homos, meaning "same" (and the same root as can be found in words like homosexual and homogenous), which derives from the Proto-Indo-European reconstruction sem, which could mean "one" or "together". Quite interesting!
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.