Also found in: Thesaurus.


1. Happening every two years. See Usage Note at bi-1.
2. Happening twice a year; semiyearly.
1. Every two years.
2. Twice a year; semiyearly.


adj, adv
1. every two years; biennial or biennially
2. (often avoided because of confusion with sense 1) twice a year; biannual or biannually. See bi-1


(baɪˈyɪər li)

1. happening every two years; biennial.
2. happening twice a year; biannual.
3. every two years.
4. twice yearly.
usage: See bi- 1.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.biyearly - occurring every second year; "they met at biennial conventions"
periodic, periodical - happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"
2.biyearly - occurring or payable twice each year
periodic, periodical - happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"
Adv.1.biyearly - every two years; "this festival takes places biennially"
2.biyearly - twice a year
References in periodicals archive ?
Tahor Group plans for this to be a biyearly event to coincide with Fashion Week.
On the other hand, patients that need biyearly check-ups, cannot schedule their appointment after the consultation, because the scheduling horizon is only 4 months.
The biyearly festival will be marking its 19th program from May 9 to June 5 with more than 100 performances by seven foreign and 35 local theater, dance and performance companies in various venues across ystanbul, the ystanbul Foundation for Culture and Arts (yKSV) announced on Monday evening during a press meeting at ystanbul's Rahmi M.
Now in its third edition, the city's home-grown animation film festival is a biyearly, noncompetitive event that seeks to promote interesting animation in Lebanon.
The pacts, including one on the joint development of a management system for effective electricity supply, were reached at the Japan-China Comprehensive Energy Conservation and Environment Forum in Tokyo, which has been held every year since 2006, with the two countries hosting it biyearly.
ICONSAT, conducted biyearly since 2003, is the 5th in the series.
The 10th edition of the biyearly show is intriguing the kingdom.
Biyearly, the Centers for Disease Control and Prevention conducts nationwide surveys, studying trends in suicidal behaviors of ninth- through 12th-grade students in public high schools.
The "new" yearly or biyearly cause of Lyme disease treatment failures is possibly wrong.
The Turkish-Greek Media Conference has been held since 2000 biyearly.
With a maximum of five credits earned for Annual Meeting sessions, members can earn their EIL certificate on a biyearly basis by attending the maximum five sessions during every annual meeting.
The Food and Drug Administration has approved biyearly dosing of the osteoporosis drug zoledronic acid (Reclast) for the prevention of bone loss in postmenopausal women, making it the first bisphosphonate in its class to get the nod for a 2-year indication.