SEDIMENTATION

deposit, sedimentation, alluviation

(noun) the phenomenon of sediment or gravel accumulating

Source: WordNet® 3.1

Etymology

Noun

sedimentation (countable and uncountable, plural sedimentations)

The separation of a suspension of solid particles into a concentrated slurry and a supernatant liquid, either to concentrate the solid or to clarify the liquid.

Source: Wiktionary

Sed`i*men*ta"tion, n.

Definition: The act of depositing a sediment; specifically (Geol.), the deposition of the material of which sedimentary rocks are formed.

Source: Webster’s Unabridged Dictionary 1913 Edition