| age(noun, time, set, round, stage) |
| period(noun, time, set, group, round) |
| cycle(noun, set, age, stage, series) |
| forever(noun, age, future, infinity) |
| years(noun, age, stage, epoch) |
| generation(noun, time, group, life, period) |
| life(noun, time, period) |
| alternation(set, round, sequence, series, phase) |
| chain(set, round, sequence, series, phase) |
| circle(set, round, sequence, series, phase) |
| circuit(set, round, sequence, series, phase) |
| contemporaries(noun, group, peers, jury) |
| isochronism(set, round, sequence, series, phase) |
| lifetime(noun, time, period) |
| loop(set, round, sequence, series, phase) |
| natural life |
| orbit(set, round, sequence, series, phase) |
| periodicity(set, round, sequence, series, phase) |
| phase(set, round, age, stage, sequence) |
| revolution(set, round, sequence, series, phase) |