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As this is a nonce word, can anyone find any sources for the first usage of this term. Googling "etymology of duology" only gives you links to genre fiction. Maybe the word should be deleted, as it is a neologism and doesn't appear in other dictionaries. --Robsinden (talk) 14:58, 10 July 2012 (UTC)

The oldest usage in Google Books appears to be 1869 [1]. There are 2 more from the 19 century so I don't think it can be considered a neologism. Duologist (talk) 15:35, 10 July 2012 (UTC)
Ah okay, thanks, I see it appears in relation to plays and operas. However, even though it isn't new, as it is still not an accepted word in dictionaries, etc., is it still not a "neologism"? --Robsinden (talk) 15:59, 10 July 2012 (UTC)
Maybe a serial one. Duologist (talk) 16:18, 10 July 2012 (UTC)
Wiktionary:Neologisms may cover this case. Duologist (talk) 16:22, 10 July 2012 (UTC)

Latin "duo" or Greek "δύο"?[edit]

How do you know it's from Latin duo and not Greek δύο ? Duologist (talk) 15:39, 10 July 2012 (UTC)

Good point. I understood that generally it was accepted to be an incorrectly formed word, like "quadrilogy", but maybe this isn't the case after all. Anything else to support your theory? --Robsinden (talk) 16:01, 10 July 2012 (UTC)