past life noun 2past-life adjective 1forms 1 noun2 •A previously lived life in a different body, according to theories of reincarnation.She claims to have been Cleopatra and Marie Antoinette in past lives. •(informal) A former period of one's life.I was a computer programmer in a past life, but now I raise pigs and chickens. past-life adjective1 •Related to a past life.Dreams about past-life experiences have haunted me for most of my life. formspast lives