| 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 | - |
| (verb) plunge nose first; drop with the nose or front first, of aircraft | - |
| sediment | (noun) matter that has been deposited by some natural process | Synonyms: deposit |
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| (verb) settle as sediment | - |
| (verb) deposit as a sediment | - |
| sedimentary | (adjective) produced by the action of water | Synonyms: aqueous |
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| (adjective) resembling or containing or formed by the accumulation of sediment | - |
| 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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| seditious | (adjective) in opposition to a civil authority or government | Synonyms: insurgent, subversive |
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| (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, inflammatory, instigative, rabble-rousing |