Just the other day I was telling someone* that she was using the word "anomaly" incorrectly only to discover that she was indeed correct and I was wrong.
So despite the opening line of Love American Style by the Mr T Experience clearly stating "You're an anomaly, that's a thing without a name." it does in fact mean a person who is unusual or a deviation from the normal or common order or form or rule.
Thanks for making me look stupid Dr Frank, I'm assuming that doctorate wasn't in English.
*someone special.