Definition of biennial

• a. - Happening, or taking place, once in two years; as, a biennial election.
• a. - Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
• n. - Something which takes place or appears once in two years; esp. a biennial examination.
• n. - A plant which exists or lasts for two years.
• a. - Happening, or taking place, once in two years; as, a biennial election.
• a. - Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
• n. - Something which takes place or appears once in two years; esp. a biennial examination.
• n. - A plant which exists or lasts for two years.