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

  Semiannual \Sem`i*an"nu*al\, a.
     [1913 Webster]

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

Contact=webmaster@dict.org Specification=RFC 2229