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3 definitions found
 for biannual
From The Collaborative International Dictionary of English v.0.48 :

  Biannual \Bi*an"nu*al\, a. [Pref. bi- + annual.]
     Occurring twice a year; half-yearly; semiannual.
     [Webster 1913 Suppl.]

From WordNet (r) 3.0 (2006) :

      adj 1: occurring or payable twice each year [syn: semiannual,
             biannual, biyearly, half-yearly]

From Moby Thesaurus II by Grady Ward, 1.0 :

  29 Moby Thesaurus words for "biannual":
     annual, biennial, bimonthly, biweekly, catamenial, centenary,
     centennial, daily, decennial, diurnal, fortnightly, hebdomadal,
     hourly, menstrual, momentary, momently, monthly, quarterly,
     quotidian, secular, semestral, semiannual, semimonthly, semiweekly,
     semiyearly, tertian, triennial, weekly, yearly

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