biannually

Every six months

Biannually means twice a year or every two years—the word is genuinely ambiguous.

Context usually clarifies: The journal is published biannually, in spring and fall suggests twice yearly, while The committee meets biannually might need additional context.

Semiannually unambiguously means twice a year; biennially unambiguously means every two years.

frequency

twice-yearly

Two times per annum

scheduling

calendar

Date-tracking system

conference · checkup · audit · inspection · assessment · evaluation · renewal · filing · submission · deadline

cycles

solstice

Day of maximum tilt

planting · monsoon · semester · midterm · interim

financial

dividend

Corporate profit share

statement · disclosure

Opposites
frequency

biannuallycontinuously

Without pause or interruption

constantly · daily · hourly · weekly · monthly

Family

biannual

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G