septenniallyadv.

1729 S. Switzer Introd. Gen. Syst. Hydrostaticks & Hydraulicks I. i. iii. 32 Irregular, which are those [springs] that are annual, which flow something every Year, though at uncertain Times of it; or septennial or decennial, which flow or are deficient septennially or decennially.

1791 J. Mackintosh Vindiciæ Gallicæ iv. 258 A House of Lords, which..should..have a majority of its members septennially or triennially nominated by the King.

1829 T. P. Thompson in Westm. Rev. July 266 It would be as much easier to take men's votes annually than septennially, as for a boy to comb his hair daily than once a week.

1846 Mrs. Gore Eng. Char., Body-Coachman I. 259 The fifteen guineas per annum were paid septennially.

1967 L. Woolf Downhill all Way ii. 128 Throughout my life..I have taken my own advice and septennially changed my occupation.

2007 M. A. McDonnell Politics of War vi. 221 Other posts, like the secretary, lieutenant governor, commissary, attorney, and solicitor general, would be chosen septennially.