We've been accustomed to the concept of privilege for as long as the English language existed. There are attestations from the dark ages of it being used as a Latin word in an English context, but it really started to grow its own identity in the 1100s CE. Since those early days, the Oxford English dictionaries lists 131 different forms of the word emerging, with spellings as diverse as priuilag and prewyllage; by the eighteenth century privilege was pretty standardized, especially due to influence from the French cognate. The aforementioned Latin word was privilegium, which had the very specific definition of "law applying to one person". That's composed of the roots privus, meaning "individual", lex, meaning "law", and the noun-forming suffix -ium. Privus (the etymon of private) comes from the Proto-Indo-European reconstruction per, or "forward", and lex comes from PIE leg, "to gather".
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.