quinquennially
/kwɪŋˈkwɛniəli/
adverb
- Every five years; once in a five-year period.
- Our family reunion is held quinquennially, so we only see some cousins every half decade.
- The committee reviews the policy quinquennially to ensure it stays up to date.
- The census in that country is conducted quinquennially rather than every ten years.