The term 'Important Historic Times' can be broken down into two crossword solutions: ERAS (4 letters). An era is a period of time in history that is defined by certain characteristics, such as a particular ruler or political system. ERAS are often used to divide up long periods of time into more manageable chunks, making it easier to study and understand the past. Examples of important historic ERAS include the Ancient Greek and Roman Empires, the Middle Ages, the Renaissance, and the Industrial Revolution.