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| |||
| age; date; day; epoch; era; period; time | |||
| series; episode | |||
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епоха : 104 phrases in 12 subjects |
| American usage, not spelling | 1 |
| Astronautics | 2 |
| Astronomy | 3 |
| Computers | 1 |
| Diplomacy | 1 |
| General | 45 |
| Geophysics | 1 |
| Historical | 8 |
| Law | 1 |
| Oil and gas | 3 |
| Religion | 1 |
| Scientific | 37 |