1.
Bi- is used at the beginning of nouns and adjectives that have ‘two’ as part of their meaning.
...a ~cultural society.
PREFIX
2.
Bi- is used to form adjectives and adverbs indicating that something happens twice in a period of time or happens once in two periods of time that follow each other.
Students meet biweekly to discuss their experiences.
...a bimonthly magazine.
PREFIX