biennially
Approximately 23,000 - 27,000 Sandhill Cranes migrate biannually through the San Luis Valley.
Compounding of interest can be done monthly, quarterly or even biannually.
The boys and their primary caretakers were each interviewed in their homes biannually for the first 4 years and annually thereafter.
His office biannually compiles data comparing the number of referred complaints relative to market share for the top 12 financial groups.

SMART Vocabulary: related words and phrases

Relating to regular periods of time
afternoons
annual
annum
bi-yearly
biannual
dailiness
daily
daily grind
evenings
fortnightly
hourly
nights
p.c.m.
p.w.
per annum
quadrennial
quadrennially
triennial
triennially
weekly
US
once every two years: 每两年一次地
The fair has been held biannually since the 1980s.自上世纪80年代以来，该展会每两年举办一次。
Synonym