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countable and uncountable, plural dilogies
Ambiguous or equivocal speech or discourse. examples
Repetition of a word or phrase. examples
(countable, nonstandard) A series of two related works. quotations
why tragedy took the form of a trilogy — not a dilogy, tetralogy, or single drama
1885, The Journal of Hellenic studies: Volume 6, page 167
another school of thought, for which Purphoros is a mirage, a mere doublet of Purkaeus, and there were never more than two linked Prometheus plays -- as it were a dilogy
1983, Reginald Pepys Winnington-Ingram, Studies in Aeschylus, page 189
Most notable of these are his “dilogy” The Salamander (1841) and The Cosmorama (1839)
2012, A New Companion to the Gothic, David Punter, page 71