The crossword solution for the term PROMINENT TIME is ERA, which stands for a period of time in history. ERA is an acronym for 'Eonothemic Relative Age, ' which is a system of geologic time divisions used to describe the age of rocks and fossils. It is divided into three main eras: the Paleozoic, Mesozoic, and Cenozoic. Each ERA is further divided into smaller units of time, such as epochs and periods.