sedimentation

[sed-uh-muhn-tey-shuhn]
noun
the deposition or accumulation of sediment.

Origin:
1870–75; sediment + -ation

self-sedimentation, noun
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World English Dictionary
sedimentation (ˌsɛdɪmɛnˈteɪʃən)
 
n
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-)
n.
The act or process of depositing or forming a sediment.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
The original modules had weakened to the point where they were folding and falling in the sedimentation basin.
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