The term 'HISTORIC BEGINNING' can be broken down into two crossword solutions: PRE (3 letters) and EPOCH (5 letters). PRE is an abbreviation for the Latin word 'prae, ' which means 'BEFORE' or 'in front of.' EPOCH is a noun that refers to a period of time in history, usually marked by significant events or changes. Together, these two words refer to a significant starting point in history, such as the beginning of a new era or the start of a revolution.