An epoch is a period of time in history or a particular stage in the development of something. The term 'of an epoch' refers to something that is particularly significant or influential during that period of time. In this case, the crossword solution for the term 'of an epoch' is 'ERAL', which stands for 'extraordinary, remarkable, amazing, and legendary'. These words describe something that is particularly noteworthy and influential during a certain period of time.