BIWEEKLY

semiweekly, biweekly

(adjective) occurring twice a week

fortnightly, biweekly

(adjective) occurring every two weeks

fortnightly, biweekly

(adverb) every two weeks; “he visited his cousins fortnightly”

semiweekly, biweekly

(adverb) twice a week; “he called home semiweekly”

biweekly

(noun) a periodical that is published twice a week or every two weeks (either 104 or 26 issues per year)

Source: WordNet® 3.1

Etymology

Adjective

biweekly (not comparable)

Occurring once every two weeks.

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

Usage notes

Like bimonthly and biennially, but unlike biannually, in the adjective and adverb senses, the prefix bi- applies to the week rather than to the events that occur, therefore giving the sense of “every two weeks”. Since the term is also used in the UK to mean “twice a week”, it is ambiguous there. In British English, for the sake of clarity, it is advisable to use one of the synonyms instead. Furthermore, in some English speaking regions, the term fortnightly is also commonly used to describe an event happening once every two weeks.