The mystery of relaxation

I’m intrigued by common words. They are like mysteries to me. I had several conversations about different methods of relaxation yesterday.
Where does the word relaxation come from? I suspect Latin. Yesss!!! “Re” means back and “lax” means loosen, and “ation” means state of.
Meditation? Probably Latin. Right again! The Latin word “meditari” means to consider, reflect.
Hypnosis? I know this is from Greek, “hypnos,” meaning sleep. I think there might even have been a minor Greek god named “Hypnos.”