Of or related to a five-year period.
{{quote-book|en|year=1879|author=F. D. Morice|title=(Morice)|Pindar|publisher=(Morice)/Chapter 3|chapter 3|page=25
(synonym of), a five-year period.
A 5th anniversary, particularly
(synonym of), the festival and religious ritual held in the 5th year of a Roman emperor's reign.