In Latin, the fourth principal part of the verb agere, meaning "to do", was actus, which could best be translated as "having been done". Actus has had an outsized influence on the English language, making up a lot of words starting with act-:
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.