The term 'Important Period' can be broken down into three crossword solutions: ERA, AGE, and EPOCH. An ERA is a period of time marked by certain characteristics or events, such as the Renaissance ERA. An AGE is a period of history with a distinct culture or way of life, such as the Iron AGE. An EPOCH is a period of time in history or a person's life, such as the Victorian EPOCH. All three terms refer to a specific period of time that is significant in some way.