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From our dictionary:
Pronunciation: (dI-dak'tik), [key]
1. intended for instruction; instructive: didactic poetry.
2. inclined to teach or lecture others too much: a boring, didactic speaker.
3. teaching or intending to teach a moral lesson.
4. didactics, (used with a sing. v.) the art or science of teaching. Also,diâ¢dac'tiâ¢cal.