__ a fortnight; every two weeks
I believe the answer is:
once
(Other definitions for once that I've seen before include "in bygone days" , "Formerly; as soon as" , "not repeatedly" , "Formerly - not repeated" , "One-time musical film and song" .)
I believe the answer is:
once
(Other definitions for once that I've seen before include "in bygone days" , "Formerly; as soon as" , "not repeatedly" , "Formerly - not repeated" , "One-time musical film and song" .)