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单词 vigintennial
释义 vigintennial, a. rare.|vaɪdʒɪnˈtɛnɪəl|
[f. viginti-, after biennial a. and n., triennial, a. and n., etc.]
Occurring once in twenty years.
1921Glasgow Herald 29 Jan. 13/3 Their [sc. the planets'] vigintennial conjunction is due a few months hence.
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