| ipsedixitism | (noun) an unsupported dogmatic assertion | Synonyms: ipse dixit |
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| nosedive | (noun) a steep nose-down descent by an aircraft | Synonyms: dive, nose dive |
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| (noun) a sudden sharp drop or rapid decline | - |
| sediment | (noun) matter that has been deposited by some natural process | Synonyms: deposit |
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| sedimentation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: alluviation, deposit |
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| sedition | (noun) an illegal action inciting resistance to lawful authority and tending to cause the disruption or overthrow of the government | - |
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