fortnightly /ˈfɔːɹtˌnaɪt.li/adjective 1adverb 1noun 1forms 1 adjective1 •Occurring once in a fortnight; once every two weeks. adverb1 •once in a fortnight; once every two weeksThat's where my column appears, in the Greenville Herald, fortnightly. — 1970 noun1 •A publication issued fortnightly (once every two weeks). formsfortnightlies
