the deposition or accumulation of sediment.

1870–75; sediment + -ation

self-sedimentation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sedimentation (ˌsɛdɪmɛnˈteɪʃən)
1.  the process of formation of sedimentary rocks
2.  the deposition or production of sediment
3.  chem, biochem the process by which large molecules or macroscopic particles are concentrated in a centrifugal field in a centrifuge or ultracentrifuge

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American Heritage
Medical Dictionary

sedimentation sed·i·men·ta·tion (sěd'ə-mən-tā'shən, -měn-)
The act or process of depositing or forming a sediment.

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