The Collaborative International Dictionary
Corrivation
Corrivation \Cor`ri*va"tion\ (-v?"sh?n), n. [L. corrivatio.]
The flowing of different streams into one. [Obs.]
--Burton.
Wiktionary
corrivation
n. 1 (context obsolete English) The flowing of different streams into one. 2 The concentration of waters from a watershed to a remote outlet