| Interesting historical periods |
| Astronomical time periods |
| Periods from midnight to noon: Abbr. |
| Pre-event periods |
| Periods in history |
| Between-periods equipment |
| Accentuated periods |
| Before-noon periods: Abbr. |
| Periods of inactivity |
| Enero-to-diciembre periods |
| Preceding periods |
| Geology class periods [subscribe to the best indie xwords today at avxwords.com] |
| Noteworthy periods |
| Astronomical periods |
| Preparation periods |
| Immeasurable periods |
| Periods just past sunset |
| Some rush-hour periods: Abbr. |
| Anticipatory periods |
| Wee-hours periods, for short |
| Periods of lessened hostilities |
| It's used between periods |
| Special holiday periods |
| 1980s Rowan Atkinson sitcom series set in various historical periods |
| Pivotal periods |
| History periods? |
| Twenty-four hora periods |
| Lengthy periods |
| Periods immediately before |
| Indefinitely long periods of time |