Etymology
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sediment (n.)

1540s, "matter which settles by gravity to the bottom of water or other liquid," from French sédiment (16c.) and directly from Latin sedimentum "a settling, sinking down, subsidence," from stem of sedere "to settle, sit" (from PIE root *sed- (1) "to sit"). Especially in geology after 1680s.

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Definitions of sediment
1
sediment (v.)
deposit as a sediment;
sediment (v.)
settle as sediment;
2
sediment (n.)
matter that has been deposited by some natural process;
Synonyms: deposit
From wordnet.princeton.edu