semiannual

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sem·i·an·nu·al / ˌsemēˈanyoōəl; ˌsemˌī-/ • adj. occurring twice a year; half-yearly: their semiannual meetings. ∎  (of a plant) living for half a year only.• n. a semiannual plant.DERIVATIVES: sem·i·an·nu·al·ly adv.

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