cycle
I
noun
age, alternation, circle, circuit, circulus, consecution, course, eon, epoch, era, flow, period, progression, recurrence, recurring period, regular return, regularity of recurrence, repetitiveness, revolution, rotation, round, sequence, succession
II
index
annum, frequency, life (period of existence), sequence, succession
Burton's Legal Thesaurus.
William C. Burton.
2006