I. adjective Date: 1800 occurring or appearing once in a fortnight, II. adverb Date: 1820 once in a fortnight ; every fortnight, III. noun (plural -lies) Date: 1940 a publication issued ~
FORTNIGHTLY
Meaning of FORTNIGHTLY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012