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The Collaborative International Dictionary
Coacervation

Coacervation \Co*ac`er*va"tion\, n. [L. coacervatio.] A heaping together. [R.]
--Bacon.

Wiktionary
coacervation

n. The separation of a colloidal system into two liquid phases, one of which (the coacervate) is more concentrated in the colloid component