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septendecennial
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septendecennial
ˌseptendeˈcennial, a. [f. L. septendecim seventeen, after biennial, septennial, etc.] Recurring every seventeen years.1896 Home Miss. (N.Y.) Sept. 252 This splendid septendecennial..anniversary.
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septem-
septem- L. septem seven, used in a few compounds, chiefly adjs. = septi-1 (which is more frequent): septemdeˈcenary [for -decennary], occurring once in 17 years; = septendecennial. ˈseptemfid, Bot. [L. -fidus cleft], divided into seven parts. ˈseptemfoil [-foil as in cinquefoil], an ornament of seve...
Oxford English Dictionary
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