Fortnightly vs. Biweekly

Happening or appearing once in or every two weeks.

Happening every two weeks.

Once in a fortnight.

Happening twice a week; semiweekly.

A publication issued once every two weeks.

A publication issued every two weeks.

A publication issued fortnightly (once every two weeks).

Every two weeks.

occurring once in a fortnight; once every two weeks

Twice a week; semiweekly. See Usage Note at bi-1.

once in a fortnight; once every two weeks

Occurring once every two weeks; fortnightly.

Occurring or appearing once in a fortnight; as, a fortnightly meeting of a club; a fortnightly magazine, or other publication.

Occurring twice a week (but see the Usage notes).

occurring every two weeks

Every two weeks.

every two weeks;

Twice a week (but see the Usage notes).

Something that is published or released once every two weeks.

Occurring or appearing once every two weeks; fortnightly.

a periodical that is published biweekly

occurring twice a week

occurring every two weeks

twice a week;

every two weeks;