GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Flocculation (?), n. (Geol.)
   1. The process by which small particles of fine soils and sediments aggregate into larger lumps.
   
   [1913 Webster]
   
   
   2. The process or event in which masses of a solid substance of perceptible size form in a liquid by aggregation of smaller particles, and usually sediment to the bottom of the containing vessel; as, “addition of a cationic polymer can cause flocculation of a negatively charged colloidal suspension”.
   
   [PJC]