| age(noun, time, round, stage) |
| eon(noun, group, round, age) |
| period(noun, time, group, round) |
| cycle(noun, age, stage, series) |
| era(noun, time, round, period) |
| course(noun, round, age, stage) |
| alternation(round, sequence, series, phase) |
| chain(round, sequence, series, phase) |
| circle(round, sequence, series, phase) |
| circuit(round, sequence, series, phase) |
| isochronism(round, sequence, series, phase) |
| loop(round, sequence, series, phase) |
| orbit(round, sequence, series, phase) |
| periodicity(round, sequence, series, phase) |
| phase(round, age, stage, sequence) |
| progression(sequence, series) |
| revolution(round, sequence, series, phase) |
| rhythm(round, sequence, series, phase) |
| ring(round, sequence, series, phase) |
| rotation(round, sequence, series, phase) |