Occuring twice per day, just as biannual means occuring twice per year.

The bi- prefix on bidaily means "divides into two," so that bidaily events occur twice each day.

See also bidiem. Similar to biennial whose latin bi- prefix bi- means "two," so bidiem means "every two days."
I set the task to run bidaily in crontab.
by Brian Layman January 11, 2008
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