premature UK /ˌpɹɛ.məˈtjʊə/US /ˌpɹi.məˈtʊɹ/adjective 3noun 1forms 3 adjective3 •Occurring before a state of readiness or maturity has arrived.premature reports of the singer's death •Taking place earlier than anticipated, prepared for, or desired.I was lost in reveries of death, and the idea of premature burial held continual possession of my brain. — 1844 •(informal) Suffering from premature ejaculation. noun1 •An infant born prematurely. formsprematures · more premature · most premature