Definition: (adjective) Happening every second year.
Synonyms: biyearly
Usage: They met at the biennial convention and lamented the fact that they would not see each other until the next meeting two years later.
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Daily Word from TheFreeDictionary
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biennial
 
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lament: to have or express very sad feelings about sb/sth
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By the way, some conference and comptitions are held biennially.
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