Definition of Supervention

Babylon English Dictionary
surprising event, unexpected occurrence
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Supervention Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
The act of supervening.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
JM Welsh <=> English Dictionary
Gorddyfodiad = n. supervention; a coming upon
WordNet 2.0

Noun
1. a following on in addition
(hypernym) happening, occurrence, natural event
(derivation) supervene