| aeon(noun, time, set, group, round) |
| year(noun, time, turn, point, piece) |
| days(noun, time, group, course, life) |
| world(noun, age, days, times) |
| millennial(adjective, time, identity, chronology) |
| orbit(noun, time, set, piece, range) |
| periodicity(set, round, sequence, series, phase) |
| rhythm(set, round, sequence, series, phase) |
| chain(noun, set, course, track, round) |
| sequence(noun, set, course, track, round) |
| series(noun, set, course, track, round) |
| succession(noun, action, go, set, try) |
| alternation(set, round, sequence, series, phase) |
| circuit(set, round, sequence, series, phase) |
| isochronism(set, round, sequence, series, phase) |
| jet age(noun, age, advent, epoch) |
| loop(set, round, sequence, series, phase) |
| revolution(set, round, sequence, series, phase) |
| ring(set, round, sequence, series, phase) |
| rotation(set, round, sequence, series, phase) |