| caisson | (noun) large watertight chamber used for construction under water | Synonyms: cofferdam, pneumatic caisson |
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| (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: coffer, lacunar |
| (noun) a chest to hold ammunition | Synonyms: ammunition chest |
| (noun) a two-wheeled military vehicle carrying artillery ammunition | - |
| frisson | (noun) an almost pleasurable sensation of fright | Synonyms: chill, quiver, shiver, shudder, thrill, tingle |
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| lesson | (noun) a task assigned for individual study | - |
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| (noun) a unit of instruction | - |
| (noun) punishment intended as a warning to others | Synonyms: deterrent example, example, object lesson |
| (noun) the significance of a story or event | Synonyms: moral |