fortnightly - Wiktionary, the free dictionary

From fortnight +‎ -ly.

fortnightly (not comparable)

1. Occurring once in a fortnight; once every two weeks.

fortnightly (not comparable)

1. once in a fortnight; once every two weeks
   • 1970, Lee Smith, "Between the Lines", as reprinted in, 2010, Mrs. Darcy and the Blue-Eyed Stranger, 2011 paperback edition, →ISBN, page 184 [1]:

     That's where my column appears, in the Greenville Herald, fortnightly.

fortnightly (plural fortnightlies)

1. A publication issued fortnightly (once every two weeks).

   Synonym: (US) biweekly