资料来源 : pyDict

连续六年的;每六年的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Sexennial \Sex*en"ni*al\, a. [L. sexennium a period of six
   years, sexennis of six years; sex six + annus a year. See
   {Six}, and {Annual}.]
   Lasting six years, or happening once in six years. -- n. A
   sexennial event.