| absorbance | (noun) (physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation | Synonyms: optical density, photographic density, transmission density |
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| charabanc | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, coach, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
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| disturbance | (noun) the act of disturbing something or someone; setting something in motion | - |
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| (noun) a noisy fight | Synonyms: affray, fray, ruffle |
| (noun) activity that is a malfunction, intrusion, or interruption | Synonyms: perturbation |
| (noun) electrical or acoustic activity that can disturb communication | Synonyms: interference, noise |
| (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, flutter, hoo-ha, hoo-hah, hurly burly, kerfuffle, to-do |
| (noun) (psychiatry) a psychological disorder of thought or emotion; a more neutral term than mental illness | Synonyms: folie, mental disorder, mental disturbance, psychological disorder |
| (noun) an unhappy and worried mental state | Synonyms: perturbation, upset |