| Answer | Crossword Clue |
|---|---|
| ERA | Significant time, in years |
| ERA | Significant time in history |
| ANNI | Years in Octavian's time |
| EON | One billion years, in geologic time |
| PIUS | Pope's name over half the time in the past 230 years |
| NICKEL | It was redesigned in 2004 for the first time in 66 years |
| ICE | For the first time in millions of years, it was absent from the North Pole |
