septennial
Every seven years
Septennial means occurring every seven years or lasting for seven years: a septennial census, septennial elections.
The word appears mainly in formal or technical contexts—legal documents, ecclesiastical cycles, political terms of office.
The septennial review of the charter is due next year.
Special anniversary observance
- centenaryHundredth anniversary observance
- centennialHundred-year anniversary
- decennialEvery ten years
- bicentennial200th anniversary observance
quinquennial · semicentennial · tricentennial · millennial · golden · silver · diamond · commemoration
Group of seven
- sabbaticalExtended leave from work
- septupleMultiply by seven
- sevenfoldSeven times over
- lustrumFive-year span
Date-tracking system
- decadeTen-year span
- centuryHundred-year span
- epochDistinct historical period
- eraDistinct historical period
millennium · year · chronology · timeline · timespan · duration · span · period
Turning on an axis
- phasesDistinct periods in sequence
- successionFollowing in order
- progressionSequential forward movement
- stagesDistinct periods or platforms
renewal · regeneration · recurrence · periodicity · rhythm · iteration · return · pattern
Happening only occasionally
- uncommonSeldom occurring or found
- sporadicOccurring irregularly, infrequently
- intermittentOccurring at irregular intervals
- occasionalHappening at intervals
irregular · exceptional · seldom · periodic · recurring · cyclical
jubilee
Special anniversary observance
- centenaryHundredth anniversary observance
- centennialHundred-year anniversary
- decennialEvery ten years
bicentennial · quinquennial · semicentennial · tricentennial · millennial · golden · silver · diamond · commemoration · milestone
heptad
Group of seven
- sabbaticalExtended leave from work
- septupleMultiply by seven
- sevenfoldSeven times over
lustrum · biennium · triennium · quadrennium
calendar
Date-tracking system
era · millennium · year · chronology · timeline · timespan · duration · span · period · interval
rotation
Turning on an axis
- phasesDistinct periods in sequence
- successionFollowing in order
- progressionSequential forward movement
stages · renewal · regeneration · recurrence · periodicity · rhythm · iteration · return · pattern · regularity
infrequent
Happening only occasionally
- uncommonSeldom occurring or found
- sporadicOccurring irregularly, infrequently
- intermittentOccurring at irregular intervals
occasional · irregular · exceptional · seldom · periodic · recurring · cyclical
septennialannual
Occurring every year
yearly · daily · quotidian · continuous · constant
septennialone-time
Occurring only once
singular · unique · nonrecurring · continuous · perpetual