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The Collaborative International Dictionary
Encheason

Encheson \En*che"son\, Encheason \En*chea"son\, n. [OF. enchaison, fr. L. incidere to happen; in + cadere to fall.] Occasion, cause, or reason. [Obs.]
--Chaucer.

Wiktionary
encheason

n. (context obsolete English) A cause, reason.