biweekly (Adjective) — Occurring every two weeks.
biweekly (Adjective) — Occurring twice a week.
biweekly (Noun) — A periodical that is published twice a week or every two weeks (either 104 or 26 issues per year).
biweekly (Adverb) — Twice a week. ex. "he called home biweekly"
biweekly (Adverb) — Every two weeks. ex. "he visited his cousins biweekly"