Definition from Wiktionary, the free dictionary
Alternative forms 
- discorsioun [16th century]
discursion (plural discursions)
- (obsolete, rare) The action of hurriedly moving hither and thither.
- (rare, figuratively) Digression.
- (rare) Ratiocination.
- (philosophy) step by step philosophic reasoning, as opposed to intuition (cf Iamblichus)
- “Oxford English Dictionary [2nd Ed.; 1989] ” listed in the