fortnightly

(fôrtnīt′lē; also, esp. for adv. fôrt nīt)

adjective, adverb

once in every fortnight, or at two-week intervals

noun pl. fortnightlies

a periodical issued at two-week intervals

See fortnightly in American Heritage Dictionary 4

adjective
Happening or appearing once in or every two weeks.
adverb
Once in a fortnight.
noun pl. fort·night·lies
A publication issued once every two weeks.

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