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Politics and the English Language - George Orwell (1946)
(1) Didactic (adj): dI-'dak-tik: Intended to convey instruction and information as well as pleasure and entertainment (2) Discursive (adj): dis-'k&r-siv: Moving from topic to topic without order (3) Diatribe (n): 'dI-&-"trIb: ironical or satirical criticism
Related to the above post, and very much worth reading: